Haloalkanes and Haloarenes MCQs for NEET

Haloalkanes and Haloarenes - NEET MCQs

1. Which of the following compounds will have the highest boiling point?
   a) CH₃Cl
   b) CH₃Br
   c) CH₃I
   d) CH₃F
2. Which of the following reactions involves a carbocation intermediate?
   a) SN1
   b) SN2
   c) E2
   d) Both SN2 and E2
3. In SN2 reaction mechanism, the rate of reaction depends upon:
   a) Only alkyl halide concentration
   b) Only nucleophile concentration
   c) Both alkyl halide and nucleophile concentration
   d) Solvent concentration
4. Which alkyl halide undergoes SN1 reaction most readily?
   a) Methyl chloride
   b) Ethyl chloride
   c) Tert-butyl chloride
   d) Benzyl chloride
5. Which of the following halides is most reactive towards SN2 reaction?
   a) CH₃Cl
   b) CH₃Br
   c) CH₃I
   d) CH₃F
6. Which reagent is used to convert alkyl halide into alcohol?
   a) NaOH (aq)
   b) NaOH (alc)
   c) NaCN
   d) NH₃
7. Chloroform reacts with alcoholic KOH to give:
   a) Methanol
   b) Formic acid
   c) Potassium formate
   d) None of these
8. Which of the following is an example of a primary alkyl halide?
   a) CH₃CH₂Cl
   b) (CH₃)₂CHCl
   c) (CH₃)₃CCl
   d) C₆H₅CH₂Cl
9. Which of the following compounds is not reactive towards nucleophilic substitution?
   a) Chlorobenzene
   b) Benzyl chloride
   c) Allyl chloride
   d) Ethyl chloride
10. The major product formed when chlorobenzene reacts with NaOH at 623 K and 300 atm is:
    a) Benzyl alcohol
    b) Phenol
    c) Benzaldehyde
    d) Benzene
11. Which of the following statements about aryl halides is incorrect?
    a) They are less reactive than alkyl halides towards nucleophilic substitution
    b) They undergo SN1 reaction easily
    c) C–Cl bond has partial double bond character
    d) Resonance reduces reactivity
12. Which of the following is used as a local anaesthetic?
    a) Chloroform
    b) Chloral hydrate
    c) Ethyl chloride
    d) Benzyl chloride
13. Which of the following is used as a refrigerant under the name Freon-12?
    a) CF₂Cl₂
    b) CHCl₃
    c) CCl₄
    d) CCl₃F
14. When chlorobenzene is heated with Cu powder, the product formed is:
    a) Benzene
    b) Phenol
    c) Benzyl chloride
    d) Aniline
15. Which of the following is not formed when chloroform is exposed to air and sunlight?
    a) Phosgene
    b) COCl₂
    c) Carbon tetrachloride
    d) None of these
16. Which of the following statements is true for SN1 reaction?
    a) Involves inversion of configuration
    b) Rate depends on nucleophile
    c) Involves carbocation intermediate
    d) Takes place in one step
17. The reaction of an alkyl halide with aqueous KOH gives:
    a) Alcohol
    b) Alkene
    c) Ether
    d) Amine
18. Which of the following halides undergoes nucleophilic substitution most easily?
    a) Benzyl chloride
    b) Ethyl chloride
    c) Isopropyl chloride
    d) Chlorobenzene
19. Which reagent is used for the conversion of alkyl halide into alkene?
    a) Alc. KOH
    b) Aq. KOH
    c) NaCN
    d) AgNO₃
20. Which of the following is an example of Fittig reaction?
    a) C₆H₅Cl + Na + C₆H₅Cl → C₆H₅–C₆H₅
    b) C₆H₅Cl + Na + CH₃Cl → C₆H₅CH₃
    c) C₂H₅Br + Na + C₂H₅Br → C₄H₁₀
    d) None of these

Answers & Solutions

1. c) CH₃I — Due to highest molecular mass and van der Waals forces.
2. a) SN1 — Involves carbocation intermediate.
3. c) Both alkyl halide and nucleophile concentration — Bimolecular reaction.
4. c) Tert-butyl chloride — Stable tertiary carbocation.
5. c) CH₃I — I⁻ is best leaving group.
6. a) NaOH (aq) — Hydrolysis to alcohol.
7. c) Potassium formate — Chloroform reacts with alc. KOH.
8. a) CH₃CH₂Cl — Primary halide.
9. a) Chlorobenzene — Due to resonance stabilization.
10. b) Phenol — At high temp and pressure.
11. b) They undergo SN1 reaction easily — Incorrect.
12. c) Ethyl chloride — Used as local anaesthetic.
13. a) CF₂Cl₂ — Freon-12.
14. a) Benzene — Reduction with Cu powder.
15. c) Carbon tetrachloride — Not formed.
16. c) Involves carbocation intermediate — True for SN1.
17. a) Alcohol — Hydrolysis product.
18. a) Benzyl chloride — Stabilized by resonance.
19. a) Alc. KOH — Dehydrohalogenation reaction.
20. a) C₆H₅Cl + Na + C₆H₅Cl → C₆H₅–C₆H₅ — Fittig reaction.