NEET 100 MCQS QUIZ CHEMISTRY 27 AUGUST

Chemistry Part 15 – Theory MCQ Online Tests

10 Tests × 10 Questions = 100 Theory Questions

Theory Questions Only: Numerical/calculation-heavy questions and questions dependent on unreadable structures/figures have been excluded. Questions are based on the uploaded Chemistry Part 15 material.

Test 1 – 10 Theory Questions

1. Homolytic fission of a covalent bond produces:

A) Electrophiles B) Nucleophiles C) Free radicals D) Carbocations

Correct Answer: C) Free radicals

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2. Heterolytic fission of a covalent bond involves:

A) Equal sharing of the bond pair B) Unequal cleavage with the bond pair going to one atom C) Formation of two free radicals D) Formation of two neutral atoms

Correct Answer: B) Unequal cleavage with the bond pair going to one atom

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3. Homolytic cleavage is described as a:

A) Symmetrical cleavage B) Unsymmetrical cleavage C) Ionic cleavage only D) Metallic cleavage

Correct Answer: A) Symmetrical cleavage

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4. In homolytic cleavage, each bonded atom retains:

A) Both bonding electrons B) No electrons C) One electron from the bond D) A proton

Correct Answer: C) One electron from the bond

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5. In heterolytic cleavage, the bonding electron pair is retained by:

A) Both atoms equally B) One of the bonded atoms C) Neither atom D) A third atom

Correct Answer: B) One of the bonded atoms

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6. Hyperconjugation is also known as:

A) No-bond resonance B) Ionic resonance C) Electromeric resonance D) Hydrogen bonding

Correct Answer: A) No-bond resonance

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7. The electromeric effect is generally a:

A) Permanent effect B) Temporary effect C) Nuclear effect D) Thermal effect

Correct Answer: B) Temporary effect

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8. The electromeric effect involves complete transfer of:

A) Sigma electrons only B) Pi electrons C) Protons D) Neutrons

Correct Answer: B) Pi electrons

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9. The +I effect refers to the:

A) Electron-withdrawing inductive effect B) Electron-releasing inductive effect C) Electron transfer by resonance D) Transfer of protons

Correct Answer: B) Electron-releasing inductive effect

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10. The –I effect refers to the:

A) Electron-releasing inductive effect B) Electron-withdrawing inductive effect C) Hyperconjugative effect D) Steric effect

Correct Answer: B) Electron-withdrawing inductive effect

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Test 2 – 10 Theory Questions

1. A nucleophile is best described as a species that is:

A) Electron seeking B) Electron rich and able to donate an electron pair C) Always positively charged D) Always neutral

Correct Answer: B) Electron rich and able to donate an electron pair

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2. A nucleophile generally behaves as a:

A) Lewis acid B) Lewis base C) Strong oxidising agent only D) Free radical only

Correct Answer: B) Lewis base

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3. Which of the following is not a nucleophile?

A) H₂O B) NH₃ C) R–OH D) FeCl₃

Correct Answer: D) FeCl₃

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4. Which of the following is a nucleophile?

A) BF₃ B) AlCl₃ C) CO₂ D) R–SH

Correct Answer: D) R–SH

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5. An electrophile is generally a species that is:

A) Electron rich B) Electron deficient and attracted to electron-rich sites C) Always negatively charged D) Unable to accept electrons

Correct Answer: B) Electron deficient and attracted to electron-rich sites

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6. Which of the following is not electrophilic?

A) AlCl₃ B) BF₃ C) NH₃ D) FeCl₃

Correct Answer: C) NH₃

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7. The geometrical shape of a simple carbocation centre is generally:

A) Linear B) Tetrahedral C) Planar D) Pyramidal

Correct Answer: C) Planar

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8. The carbon atom of a classical carbocation is generally:

A) sp hybridised B) sp² hybridised C) sp³ hybridised D) d²sp³ hybridised

Correct Answer: B) sp² hybridised

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9. An E1 elimination reaction proceeds through a:

A) Carbanion B) Carbocation C) Free radical D) Carbene

Correct Answer: B) Carbocation

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10. A tertiary carbocation is generally more stable than a primary carbocation because of:

A) Only steric strain B) Hyperconjugation and inductive effects C) Only hydrogen bonding D) Only electromeric effect

Correct Answer: B) Hyperconjugation and inductive effects

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Test 3 – 10 Theory Questions

1. The stability of alkyl free radicals is significantly influenced by:

A) Hyperconjugation and +I effect B) Only –I effect C) Only hydrogen bonding D) Only resonance of benzene

Correct Answer: A) Hyperconjugation and +I effect

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2. The usual stability order of simple alkyl carbocations is:

A) Methyl > primary > secondary > tertiary B) Tertiary > secondary > primary > methyl C) Primary > secondary > tertiary > methyl D) Secondary > tertiary > primary > methyl

Correct Answer: B) Tertiary > secondary > primary > methyl

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3. The usual stability order of simple alkyl carbanions is:

A) Tertiary > secondary > primary > methyl B) Methyl > primary > secondary > tertiary C) Secondary > primary > methyl > tertiary D) Primary > tertiary > secondary > methyl

Correct Answer: B) Methyl > primary > secondary > tertiary

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4. Resonance generally stabilizes a reactive intermediate by:

A) Localising charge completely B) Delocalising electrons or charge C) Increasing bond strain D) Removing all electrons

Correct Answer: B) Delocalising electrons or charge

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5. An allylic carbocation is stabilised mainly by:

A) Resonance B) Only steric effect C) Only angle strain D) Hydrogen bonding

Correct Answer: A) Resonance

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6. A benzylic carbocation is particularly stable because its positive charge can be:

A) Removed by heating B) Delocalised into the aromatic ring C) Converted into a proton D) Transferred only to hydrogen

Correct Answer: B) Delocalised into the aromatic ring

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7. A group showing a strong –I effect tends to:

A) Push electron density toward the attached carbon chain B) Withdraw electron density through sigma bonds C) Donate a proton D) Break all pi bonds

Correct Answer: B) Withdraw electron density through sigma bonds

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8. A group showing +I effect tends to:

A) Withdraw electron density B) Release electron density through sigma bonds C) Prevent all resonance D) Create hydrogen bonds

Correct Answer: B) Release electron density through sigma bonds

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9. The stability of an alkene is generally increased by:

A) Appropriate alkyl substitution and hyperconjugation B) Removing all carbon atoms C) Increasing angle strain only D) Eliminating all sigma bonds

Correct Answer: A) Appropriate alkyl substitution and hyperconjugation

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10. The most stable alkene among cis/trans isomers of the same substituted alkene is generally the:

A) More sterically crowded form B) Less sterically crowded trans form C) Always the cis form D) Unsubstituted radical

Correct Answer: B) Less sterically crowded trans form

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Test 4 – 10 Theory Questions

1. Conversion of an alkyl halide into an alcohol using aqueous KOH is an example of:

A) Nucleophilic substitution B) Electrophilic substitution C) Elimination only D) Free-radical addition

Correct Answer: A) Nucleophilic substitution

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2. Removal of atoms/groups from adjacent carbon atoms to form a double bond is called:

A) Substitution B) Elimination C) Hydrolysis D) Polymerisation

Correct Answer: B) Elimination

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3. Addition reactions of alkenes involve:

A) Addition across a multiple bond B) Removal of two atoms C) Only aromatic substitution D) Only ionic cleavage

Correct Answer: A) Addition across a multiple bond

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4. α-Elimination is associated with formation of:

A) A carbene or substituted carbene B) A benzene ring only C) A carbanion only D) An alkene only

Correct Answer: A) A carbene or substituted carbene

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5. An E1 reaction is characterised by formation of an intermediate:

A) Carbocation B) Carbene C) Nucleophile D) Peroxide

Correct Answer: A) Carbocation

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6. An SN1 reaction involves a slow step that produces a:

A) Carbocation B) Carbanion C) Free radical D) Concerted transition state only

Correct Answer: A) Carbocation

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7. A reaction in which a nucleophile replaces a leaving group is called:

A) Nucleophilic substitution B) Electrophilic addition C) Free-radical substitution only D) Elimination

Correct Answer: A) Nucleophilic substitution

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8. Photochlorination of methane proceeds through:

A) Homolytic bond fission and radicals B) Only heterolytic fission C) A carbocation intermediate D) A carbene intermediate

Correct Answer: A) Homolytic bond fission and radicals

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9. Reaction classification is based mainly on the:

A) Overall change in bonding and molecular structure B) Colour of the reactants C) Density of the solvent D) Boiling point of the product

Correct Answer: A) Overall change in bonding and molecular structure

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10. The peroxide effect is associated specifically with addition of:

A) HBr B) HCl C) HI D) HF

Correct Answer: A) HBr

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Test 5 – 10 Theory Questions

1. The general formula of an open-chain saturated hydrocarbon (alkane) is:

A) CₙH₂ₙ B) CₙH₂ₙ₊₂ C) CₙH₂ₙ₋₂ D) CₙHₙ

Correct Answer: B) CₙH₂ₙ₊₂

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2. A branched hydrocarbon differs from its straight-chain isomer mainly in:

A) Carbon skeleton arrangement B) Number of elements present C) Atomic masses D) Number of protons in carbon

Correct Answer: A) Carbon skeleton arrangement

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3. n-Butane and isobutane are:

A) Identical compounds B) Structural isomers C) Optical isomers D) Geometrical isomers

Correct Answer: B) Structural isomers

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4. Structural isomers have the same:

A) Molecular formula but different structural arrangements B) Structural formula and different molecular formula C) Only boiling point D) Only physical state

Correct Answer: A) Molecular formula but different structural arrangements

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5. The boiling point of continuous-chain alkanes generally increases with:

A) Increase in carbon-chain length B) Decrease in carbon number C) Removal of all hydrogen D) Increase in branching only

Correct Answer: A) Increase in carbon-chain length

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6. Commercial gasoline generally favours hydrocarbons with:

A) Branched structures B) Only straight-chain structures C) Only alkynes D) Only benzene

Correct Answer: A) Branched structures

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7. Wurtz reaction is used primarily for the preparation of:

A) Higher alkanes from alkyl halides B) Aromatic nitro compounds C) Alcohols from ketones D) Alkenes from alcohols

Correct Answer: A) Higher alkanes from alkyl halides

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8. Kolbe electrolysis is associated with preparation of:

A) Alkanes from carboxylate salts B) Aromatic rings from phenols C) Alkynes from alcohols D) Haloarenes from benzene

Correct Answer: A) Alkanes from carboxylate salts

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9. Alkanes are classified as:

A) Saturated hydrocarbons B) Unsaturated hydrocarbons C) Aromatic hydrocarbons D) Heterocyclic compounds

Correct Answer: A) Saturated hydrocarbons

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10. An alkane contains carbon-carbon bonds that are primarily:

A) Single sigma bonds B) Double pi bonds C) Triple bonds D) Aromatic bonds

Correct Answer: A) Single sigma bonds

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Test 6 – 10 Theory Questions

1. Alkenes are more reactive than alkanes largely because alkenes contain:

A) A carbon-carbon double bond B) Only stronger C–H bonds C) No pi electrons D) Only ionic bonds

Correct Answer: A) A carbon-carbon double bond

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2. Geometrical isomerism in 2-butene arises because of:

A) Restricted rotation about the C=C bond B) Free rotation about the C=C bond C) Rotation around a triple bond D) Presence of a metal atom

Correct Answer: A) Restricted rotation about the C=C bond

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3. Cis-trans isomers are examples of:

A) Configurational isomers B) Constitutional isomers only C) Chain isomers only D) Functional isomers only

Correct Answer: A) Configurational isomers

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4. An alkene can show geometrical isomerism when each carbon of the double bond has:

A) Two different substituents B) Two identical substituents C) No hydrogen or substituent D) Only hydrogen atoms

Correct Answer: A) Two different substituents

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5. The cylindrical shape of an alkyne is associated with:

A) sp hybridisation B) sp² hybridisation C) sp³ hybridisation D) dsp² hybridisation

Correct Answer: A) sp hybridisation

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6. A carbon-carbon triple bond contains:

A) One sigma and two pi bonds B) Two sigma and one pi bond C) Three sigma bonds D) Three pi bonds

Correct Answer: A) One sigma and two pi bonds

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7. The geometry around an sp-hybridised carbon is:

A) Linear B) Trigonal planar C) Tetrahedral D) Pyramidal

Correct Answer: A) Linear

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8. The peroxide effect is not observed with:

A) HCl and HI B) HBr only C) HF only D) HBr and HF

Correct Answer: A) HCl and HI

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9. Hydration of an unsaturated hydrocarbon is classified as an:

A) Addition reaction B) Elimination reaction C) Substitution reaction D) Oxidation only

Correct Answer: A) Addition reaction

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10. Dehydration of an alcohol to form an alkene is classified as an:

A) Elimination reaction B) Addition reaction C) Neutralisation reaction D) Free-radical substitution

Correct Answer: A) Elimination reaction

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Test 7 – 10 Theory Questions

1. Conformations arise due to rotation around a:

A) Carbon-carbon single bond B) Carbon-carbon double bond C) Carbon-carbon triple bond only D) C–H bond only

Correct Answer: A) Carbon-carbon single bond

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2. The most stable conformation of ethane is the:

A) Eclipsed form B) Staggered form C) Planar form D) Linear form

Correct Answer: B) Staggered form

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3. The eclipsed conformation of ethane has higher energy mainly because of:

A) Torsional strain B) No electron interaction C) Absence of sigma bonds D) Resonance

Correct Answer: A) Torsional strain

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4. The dihedral angle in staggered ethane is:

A) 0° B) 60° C) 90° D) 120°

Correct Answer: B) 60°

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5. The most stable conformation of n-butane is the:

A) Fully eclipsed form B) Gauche form C) Anti form D) Half-eclipsed form

Correct Answer: C) Anti form

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6. The anti conformation of n-butane is favoured because it:

A) Minimises steric repulsion B) Maximises torsional strain C) Has maximum eclipsing D) Contains a triple bond

Correct Answer: A) Minimises steric repulsion

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7. Torsional strain is associated with repulsive interaction between:

A) Electron clouds of bonds on adjacent atoms B) Atomic nuclei only C) Two protons in water D) Only pi electrons

Correct Answer: A) Electron clouds of bonds on adjacent atoms

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8. The chair form of cyclohexane is:

A) Highly strained and unstable B) The most stable common conformation C) A planar conformation D) A linear conformation

Correct Answer: B) The most stable common conformation

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9. The chair form of cyclohexane is essentially free from:

A) Angle strain B) All molecular motion C) All C–H bonds D) All steric interactions

Correct Answer: A) Angle strain

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10. Cyclohexane commonly exists in two principal conformations:

A) Chair and boat B) Linear and planar C) Cis and trans only D) Anti and gauche only

Correct Answer: A) Chair and boat

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Test 8 – 10 Theory Questions

1. The molecular formula of benzene is:

A) C₆H₆ B) C₆H₁₂ C) C₇H₈ D) C₆H₅

Correct Answer: A) C₆H₆

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2. Benzene is unusually stable because of:

A) Delocalisation of pi electrons B) Only sigma bonds C) Absence of electrons D) High angle strain

Correct Answer: A) Delocalisation of pi electrons

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3. The carbon-carbon bond order in benzene is often described as approximately:

A) 1 B) 1.5 C) 2 D) 3

Correct Answer: B) 1.5

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4. Benzene generally prefers substitution reactions over addition because substitution:

A) Preserves aromatic stabilisation B) Destroys all aromaticity permanently C) Removes all pi electrons D) Creates a saturated alkane directly

Correct Answer: A) Preserves aromatic stabilisation

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5. Aromatic compounds are characterised by:

A) A cyclic delocalised pi-electron system with aromatic stabilisation B) Only isolated single bonds C) Only saturated carbon atoms D) No resonance

Correct Answer: A) A cyclic delocalised pi-electron system with aromatic stabilisation

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6. A polynuclear aromatic hydrocarbon contains:

A) More than one fused or connected aromatic ring system B) Only one saturated ring C) Only an alkyl chain D) No carbon atoms

Correct Answer: A) More than one fused or connected aromatic ring system

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7. Anthracene is an example of a:

A) Polynuclear aromatic hydrocarbon B) Alkane C) Cycloalkane D) Haloalkane

Correct Answer: A) Polynuclear aromatic hydrocarbon

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8. Naphthalene is an example of a:

A) Aromatic hydrocarbon B) Aliphatic alkane C) Cycloalkene only D) Haloalkane

Correct Answer: A) Aromatic hydrocarbon

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9. In electrophilic aromatic substitution, the attacking electrophile reacts with the:

A) Electron-rich aromatic ring B) Only the solvent C) Only a saturated carbon chain D) Only a leaving group

Correct Answer: A) Electron-rich aromatic ring

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10. The aromatic ring is stabilised by:

A) Resonance/delocalisation B) Only inductive effect C) Only steric effect D) Only torsional strain

Correct Answer: A) Resonance/delocalisation

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Test 9 – 10 Theory Questions

1. The –NO₂ group is generally:

A) Electron withdrawing and deactivating B) Electron donating and strongly activating C) A neutral substituent D) A +I donor only

Correct Answer: A) Electron withdrawing and deactivating

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2. The –OH group on a benzene ring can show a:

A) +R effect B) Only –R effect C) No resonance effect D) Only +I effect

Correct Answer: A) +R effect

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3. The –NH₂ group generally activates benzene toward electrophilic substitution through:

A) Electron donation by resonance B) Strong electron withdrawal by resonance C) Loss of aromaticity D) Only steric effects

Correct Answer: A) Electron donation by resonance

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4. Nitrobenzene is relatively unreactive toward Friedel–Crafts reaction because –NO₂:

A) Strongly deactivates the aromatic ring B) Strongly activates the ring C) Has no electronic effect D) Creates a saturated ring

Correct Answer: A) Strongly deactivates the aromatic ring

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5. Toluene is more reactive than benzene toward electrophilic substitution because the methyl group:

A) Donates electron density B) Withdraws electron density strongly C) Removes aromaticity D) Prevents resonance

Correct Answer: A) Donates electron density

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6. Halogens on benzene generally show:

A) Deactivation by induction but ortho/para direction B) Strong activation and meta direction C) Only +I effect D) No directing effect

Correct Answer: A) Deactivation by induction but ortho/para direction

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7. In mono-haloarenes, electrophilic substitution is generally directed to:

A) Ortho and para positions B) Meta position only C) The side chain only D) No position

Correct Answer: A) Ortho and para positions

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8. A –NO₂ substituent is generally a:

A) Meta director B) Ortho/para director C) Non-directing group D) Hydrogen-bond donor only

Correct Answer: A) Meta director

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9. A –CH₃ substituent is generally an:

A) Ortho/para director B) Meta director C) Electron-withdrawing meta director D) Non-aromatic substituent

Correct Answer: A) Ortho/para director

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10. A strong electron-withdrawing substituent generally makes an aromatic ring:

A) Less reactive toward electrophilic substitution B) More reactive in every case C) Unchanged in all conditions D) Non-cyclic

Correct Answer: A) Less reactive toward electrophilic substitution

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Test 10 – 10 Theory Questions

1. Benzene reacts with chlorine in the presence of FeCl₃ and absence of sunlight to form:

A) Chlorobenzene B) Benzyl chloride C) Benzal chloride D) Benzene hexachloride

Correct Answer: A) Chlorobenzene

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2. The electrophile used in nitration of benzene is:

A) NO₂⁺ B) Br⁺ C) NH₂⁻ D) Cl⁻

Correct Answer: A) NO₂⁺

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3. The nitration of benzene is an example of:

A) Electrophilic aromatic substitution B) Nucleophilic addition C) Free-radical elimination D) Nucleophilic substitution

Correct Answer: A) Electrophilic aromatic substitution

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4. The Friedel–Crafts alkylation reaction introduces a(n):

A) Alkyl group into an aromatic ring B) Nitro group into an alkene C) Hydroxyl group into an alkane D) Halide into a carbanion

Correct Answer: A) Alkyl group into an aromatic ring

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5. A suitable alkyl halide for Friedel–Crafts alkylation is:

A) Isopropyl chloride B) Chlorobenzene C) Bromobenzene D) Chloroethene

Correct Answer: A) Isopropyl chloride

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6. The reaction of an alkyl halide with sodium in dry ether is called:

A) Wurtz reaction B) Birch reduction C) Kolbe reaction D) Reimer–Tiemann reaction

Correct Answer: A) Wurtz reaction

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7. Reduction using sodium in liquid ammonia is called:

A) Birch reduction B) Wurtz reaction C) Friedel–Crafts reaction D) Haloform reaction

Correct Answer: A) Birch reduction

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8. A benzoyl peroxide initiator is associated with:

A) Free-radical reactions B) Electrophilic aromatic substitution only C) Ionic hydration only D) Acid-base neutralisation

Correct Answer: A) Free-radical reactions

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9. The SN1 mechanism is favoured by formation of a relatively stable:

A) Carbocation intermediate B) Carbanion intermediate C) Carbene only D) Neutral alkene only

Correct Answer: A) Carbocation intermediate

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10. The C–X bond in a haloalkane is strongest when X is:

A) Fluorine B) Chlorine C) Bromine D) Iodine

Correct Answer: A) Fluorine

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