12TH CBSE CHEMISTRY Haloalkanes and Haloarenes 75 QUIZ – Theory MCQs

Haloalkanes and Haloarenes – Theory MCQs

5 Tests × 10 Questions = 50 Theory / Conceptual MCQs

Submit செய்த பிறகு ஒவ்வொரு கேள்வியிலும் சரியான விடை காட்டப்படும்.

Test 1 – 10 Theory Questions

1. Which mechanism is generally favored by primary alkyl halides?

A) SN1B) SN2C) E1D) Addition

Correct Answer: B) SN2

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2. Which mechanism is generally predominant for tertiary alkyl halides?

A) SN1B) SN2C) E2D) Addition

Correct Answer: A) SN1

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3. Why is SN2 favored for primary alkyl halides?

A) Stable carbocationB) Less steric hindranceC) ResonanceD) Ionic bond

Correct Answer: B) Less steric hindrance

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4. Which solvent generally favors SN1 reactions?

A) Non-polarB) Polar aproticC) Polar proticD) Hydrocarbon

Correct Answer: C) Polar protic

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5. Why do polar protic solvents favor SN1?

A) Destabilize carbocationB) Solvate and stabilize carbocationC) Prevent ionizationD) Remove leaving group

Correct Answer: B) Solvate and stabilize carbocation

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6. Why are polar aprotic solvents useful for SN2?

A) Strongly solvate nucleophileB) Do not strongly solvate nucleophileC) Form carbocationsD) Weaken every C-X bond

Correct Answer: B) Do not strongly solvate nucleophile

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7. What stereochemical result is typical of SN2?

A) RacemizationB) InversionC) Retention onlyD) No change

Correct Answer: B) Inversion

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8. What stereochemical result is commonly associated with SN1 of an optically active halide?

A) RacemizationB) Only inversionC) Only retentionD) No reaction

Correct Answer: A) Racemization

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9. What key intermediate is formed in SN1?

A) CarbanionB) CarbocationC) Free radicalD) Carbene

Correct Answer: B) Carbocation

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10. What is especially important for SN1 reactivity?

A) Carbocation stabilityB) Only nucleophile sizeC) Only boiling pointD) Only molecular mass

Correct Answer: A) Carbocation stability

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Test 2 – 10 Theory Questions

1. Why are haloarenes less reactive than haloalkanes toward nucleophilic substitution?

A) Resonance gives partial double-bond character to C-XB) No carbonC) No C-X bondD) Always ionic

Correct Answer: A) Resonance gives partial double-bond character to C-X

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2. What does resonance do to the C-X bond in haloarenes?

A) Partial double-bond characterB) Makes it ionicC) Removes halogenD) Creates H-bond

Correct Answer: A) Partial double-bond character

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3. Why is the carbon attached to halogen in an aryl halide relatively electronegative?

A) sp3 hybridisedB) sp2 hybridisedC) sp hybridisedD) Unhybridised

Correct Answer: C) sp hybridised

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4. What does an ortho/para nitro group generally do to nucleophilic substitution in haloarenes?

A) Decrease reactivityB) Increase reactivityC) No effectD) Prevent substitution

Correct Answer: B) Increase reactivity

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5. Why does a nitro group facilitate nucleophilic substitution?

A) Raises electron densityB) Lowers electron density and stabilizes intermediateC) Oxidizes halogenD) Prevents resonance

Correct Answer: B) Lowers electron density and stabilizes intermediate

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6. Halogens attached to benzene are generally which directing groups?

A) MetaB) Ortho-paraC) Para onlyD) Non-directing

Correct Answer: B) Ortho-para

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7. How do halogens affect benzene's overall electrophilic substitution reactivity?

A) Activate stronglyB) DeactivateC) No effectD) Convert to alkane

Correct Answer: B) Deactivate

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8. Which effects do halogens show on a benzene ring?

A) +I and -MB) -I and +MC) +I and +MD) -I only

Correct Answer: B) -I and +M

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9. Why is chlorobenzene less reactive than benzene but ortho-para directing?

A) -I deactivates while +M controls orientationB) +I deactivatesC) No resonanceD) Cl is positive

Correct Answer: A) -I deactivates while +M controls orientation

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10. Why are vinyl halides difficult to undergo nucleophilic substitution?

A) C-X has partial double-bond characterB) Only single bondsC) Always ionicD) Stable carbanion

Correct Answer: A) C-X has partial double-bond character

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Test 3 – 10 Theory Questions

1. What is the nature of the C-X bond in haloalkanes?

A) IonicB) Polar covalentC) MetallicD) Coordinate

Correct Answer: B) Polar covalent

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2. Which C-X bond is generally strongest?

A) C-FB) C-ClC) C-BrD) C-I

Correct Answer: A) C-F

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3. What is the increasing order of C-X bond dissociation enthalpy?

A) C-F<C-Cl<C-Br<C-IB) C-I<C-Br<C-Cl<C-FC) C-Br<C-I<C-F<C-ClD) C-Cl<C-I<C-Br<C-F

Correct Answer: B) C-I<C-Br<C-Cl<C-F

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4. Which C-X bond generally has the greatest bond length?

A) C-FB) C-ClC) C-BrD) C-I

Correct Answer: D) C-I

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5. What happens to C-X bond length as halogen size increases?

A) DecreasesB) IncreasesC) ConstantD) Zero

Correct Answer: B) Increases

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6. For the same alkyl group, what is the usual boiling-point order?

A) RF>RCl>RBr>RIB) RI>RBr>RCl>RFC) RCl>RF>RI>RBrD) RBr>RI>RF>RCl

Correct Answer: B) RI>RBr>RCl>RF

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7. Why do boiling points generally increase from RF to RI?

A) Van der Waals forces increaseB) C-X strength increasesC) Hydrogen bonding increasesD) Molecules become ionic

Correct Answer: A) Van der Waals forces increase

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8. Why are branched alkyl halides generally lower-boiling than straight-chain isomers?

A) Less surface area and weaker van der Waals attractionB) Ionic bondingC) More H-bondingD) Only longer C-X bond

Correct Answer: A) Less surface area and weaker van der Waals attraction

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9. Why are haloalkanes only slightly soluble or insoluble in water?

A) Cannot effectively form H-bonds with waterB) Completely ionicC) Many OH groupsD) Always react with water

Correct Answer: A) Cannot effectively form H-bonds with water

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10. Why is the C-X bond polar covalent?

A) Halogen is more electronegative than carbonB) Carbon is more electronegativeC) It is metallicD) It is hydrogen bonding

Correct Answer: A) Halogen is more electronegative than carbon

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Test 4 – 10 Theory Questions

1. What is the reaction of alkyl halides with sodium in dry ether called?

A) Friedel-CraftsB) WurtzC) SandmeyerD) Gattermann

Correct Answer: B) Wurtz

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2. What is the main feature of the Wurtz reaction?

A) Couples alkyl halides to a higher alkaneB) Oxidizes alcoholC) Nitrates benzeneD) Hydrates alkene

Correct Answer: A) Couples alkyl halides to a higher alkane

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3. What is the coupling of aryl halides with sodium in dry ether called?

A) FittigB) WurtzC) KolbeD) Reimer-Tiemann

Correct Answer: A) Fittig

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4. Which reagent is commonly used for dehydrohalogenation?

A) Aqueous NaClB) Alcoholic KOHC) Dilute HClD) Water

Correct Answer: B) Alcoholic KOH

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5. Dehydrohalogenation is what type of reaction?

A) AdditionB) Beta-eliminationC) EsterificationD) Polymerisation

Correct Answer: B) Beta-elimination

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6. What feature is required for elimination from an alkyl halide?

A) Suitable beta-hydrogenB) Carbonyl groupC) OH on ringD) Metal atom

Correct Answer: A) Suitable beta-hydrogen

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7. What rule predicts the major, more substituted alkene in many eliminations?

A) Saytzeff ruleB) Markovnikov ruleC) Octet ruleD) Hess law

Correct Answer: A) Saytzeff rule

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8. How can alkyl halides be prepared from alkanes?

A) Free-radical halogenationB) Friedel-Crafts acylationC) Ester hydrolysisD) Aldol condensation

Correct Answer: A) Free-radical halogenation

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9. How can alkyl halides be prepared from alcohols according to the source?

A) Replace -OH with halogen using suitable halogenating reagentsB) Oxidize to alkene onlyC) Nitrate the alcoholD) Polymerise it

Correct Answer: A) Replace -OH with halogen using suitable halogenating reagents

More practice: CBSE Class 12 Physics

10. How are aryl halides generally prepared according to the source?

A) Electrophilic substitution on aromatic ringsB) Hydration of alkeneC) Oxidation of alcoholD) Hydrolysis of alkane

Correct Answer: A) Electrophilic substitution on aromatic rings

More practice: CBSE Class 12 Chemistry

Test 5 – 10 Theory Questions

1. Why are allyl halides relatively reactive toward nucleophilic substitution?

A) Allylic intermediate is resonance stabilizedB) They are ionicC) They contain no halogenD) They are aryl halides

Correct Answer: A) Allylic intermediate is resonance stabilized

More practice: CBSE Class 12 Biology

2. What distinguishes an allylic halide from a vinylic halide?

A) Halogen is adjacent to C=C in allylic halide but directly attached to C=C carbon in vinylic halideB) Both are identicalC) Both have halogen on benzeneD) Neither has C-X

Correct Answer: A) Halogen is adjacent to C=C in allylic halide but directly attached to C=C carbon in vinylic halide

More practice: CBSE Class 12 Computer Science

3. What does a polar protic solvent do in substitution reactions?

A) Solvates ions/nucleophiles through hydrogen bondingB) Removes solventC) Always gives E2D) Makes nucleophiles gases

Correct Answer: A) Solvates ions/nucleophiles through hydrogen bonding

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4. Which statement about tertiary alkyl halides is generally correct?

A) They commonly favor SN1B) They always favor SN2C) They cannot substituteD) They are aryl halides

Correct Answer: A) They commonly favor SN1

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5. Which statement about secondary alkyl halides is correct?

A) They may undergo SN1 or SN2 depending on conditionsB) Only SN1C) Only SN2D) Cannot substitute

Correct Answer: A) They may undergo SN1 or SN2 depending on conditions

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6. Which is an industrial/everyday application stated for haloalkanes and haloarenes?

A) Solvents and starting materials for synthesisB) Only fertilizersC) Only food preservativesD) No applications

Correct Answer: A) Solvents and starting materials for synthesis

More practice: CBSE Class 12 Physics

7. Which compound is identified as an anaesthetic used during surgery?

A) ChloroquineB) HalothaneC) ThyroxineD) Chloramphenicol

Correct Answer: B) Halothane

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8. Why is chlorobenzene difficult to hydrolyse compared with chloroethane?

A) C-Cl has partial double-bond character due to resonanceB) Carbon is sp3C) No C-Cl bondD) It is an alkane

Correct Answer: A) C-Cl has partial double-bond character due to resonance

More practice: CBSE Class 12 Biology

9. Why does branching lower boiling point?

A) Molecule becomes more compact and surface area decreasesB) Molecular mass becomes zeroC) Hydrogen bonds increaseD) It becomes ionic

Correct Answer: A) Molecule becomes more compact and surface area decreases

More practice: CBSE Class 12 Computer Science

10. What happens when an electron-withdrawing nitro group is placed at ortho/para position of an aryl halide?

A) Nucleophilic substitution becomes easierB) It always prevents substitutionC) It removes benzeneD) It converts aryl halide to alkane

Correct Answer: A) Nucleophilic substitution becomes easier

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