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NEET UG Haloalkanes and Haloarenes — practice questions

Explore 92 free Haloalkanes and Haloarenes questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Haloalkanes and Haloarenes questions and exercises with answers

Showing questions 1–30 of 92.

The C–X bond enthalpies follow the order:Read the answer and worked solution →Among alkyl halides, the order of reactivity towards nucleophilic substitution (for the same R group) is:Read the answer and worked solution →The order of reactivity of alcohols with a given haloacid (HCl, HBr, HI) is:Read the answer and worked solution →The reaction of alkyl chloride/bromide with NaI in dry acetone to form alkyl iodide is called:Read the answer and worked solution →Among methyl chloride, methyl bromide and methyl iodide, the order of boiling points is:Read the answer and worked solution →Grignard reagent (RMgX) is prepared by:Read the answer and worked solution →A molecule that is non-superimposable on its mirror image is called:Read the answer and worked solution →Stereoisomers that are non-superimposable mirror images of each other are called:Read the answer and worked solution →A racemic mixture is:Read the answer and worked solution →As per your syllabus, the general formula of an alkane (saturated open-chain hydrocarbon) is which?Read the answer and worked solution →As per your syllabus, + Fig 9.1, the H-C-H bond angle in methane and the carbon hybridisation are which?Read the answer and worked solution →As per your syllabus, (ii), the Wurtz reaction uses which reagent + solvent for coupling alkyl halides?Read the answer and worked solution →As per your syllabus, (i), heating CH₃COONa with NaOH + CaO (soda-lime) produces which gas?Read the answer and worked solution →As per your syllabus, (ii), in Kolbe electrolytic synthesis of alkanes, the alkane gas is liberated at which electrode?Read the answer and worked solution →As per your syllabus, the rate of HALOGENATION of alkanes (F₂, Cl₂, Br₂, I₂) decreases in which order?Read the answer and worked solution →As per your syllabus, the rate of substitution of HYDROGENS in alkane halogenation goes in which order (by carbon class)?Read the answer and worked solution →As per your syllabus, Mechanism, the FIRST step of methane chlorination under sunlight is best described as which?Read the answer and worked solution →As per your syllabus, the STAGGERED form of ethane is more stable than ECLIPSED for which reason?Read the answer and worked solution →In haloalkanes, the halogen is bonded to a carbon with which hybridisation?Read the answer and worked solution →In haloarenes, the halogen is attached to which kind of carbon?Read the answer and worked solution →Which chlorine-containing antibiotic is very effective against typhoid?Read the answer and worked solution →Which iodine-containing hormone, when deficient, causes goitre?Read the answer and worked solution →Which synthetic halogen compound is used to treat malaria?Read the answer and worked solution →Which halogen compound is used as an anaesthetic during surgery?Read the answer and worked solution →A halogen on an sp3 carbon next to a C=C double bond forms which halide?Read the answer and worked solution →In a C-X bond of an alkyl halide, the carbon atom carries what?Read the answer and worked solution →How does carbon-halogen bond length change going from F to I?Read the answer and worked solution →Why is SOCl2 preferred for making alkyl chlorides from alcohols?Read the answer and worked solution →Primary alcohols react with HCl to give alkyl chlorides in presence of?Read the answer and worked solution →What is the reactivity order of alcohols with a given halogen acid?Read the answer and worked solution →

Worked practice questions

The C–X bond enthalpies follow the order:

  1. C–F < C–Cl < C–Br < C–I
  2. All bond enthalpies are equal
  3. C–I > C–Br > C–F > C–Cl
  4. C–F > C–Cl > C–Br > C–I (decreases down the group)
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Correct answer: D. C–F > C–Cl > C–Br > C–I (decreases down the group)

**Bond enthalpy decreases down the group**: C–F (452) > C–Cl (351) > C–Br (293) > C–I (234 kJ/mol). **Reason:** bond length **increases** down the group as halogen size grows → weaker bond. C–I is the weakest, so iodide is the best leaving group.

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Among alkyl halides, the order of reactivity towards nucleophilic substitution (for the same R group) is:

  1. R-F > R-Cl > R-Br > R-I
  2. R-I > R-Br > R-Cl > R-F
  3. R-Cl > R-Br > R-I > R-F
  4. All have identical reactivity
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Correct answer: B. R-I > R-Br > R-Cl > R-F

**R-I > R-Br > R-Cl > R-F**. **Two reasons:** (i) **bond enthalpy decreases I > Br > Cl > F** (easier to break) (ii) **iodide is a better leaving group** because of polarisability/larger size — more stable as a free anion.

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The order of reactivity of alcohols with a given haloacid (HCl, HBr, HI) is:

  1. Allylic = Benzylic only
  2. Primary > Secondary > Tertiary
  3. Tertiary > Secondary > Primary (3° > 2° > 1°)
  4. Primary = Secondary = Tertiary
Show answer and solution

Correct answer: C. Tertiary > Secondary > Primary (3° > 2° > 1°)

Reactivity with HX follows **3° > 2° > 1°**. Mechanism is SN1 — proceeds via a **carbocation**, and tertiary carbocations are most stable. Primary alcohols + HCl need **ZnCl₂ catalyst** (Lucas reagent) tertiary alcohols react at room temp without catalyst.

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