300+ TOP MCQs on Haloalkanes and Haloarenes and Answers

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MCQs on Haloalkanes and Haloarenes :

1. Which of the following undergoes nucleophilic substitution exclusively by S_N1 mechanism?
(A) Benzyl Chloride
(B) Ethyl chloride
(C) Chlorobenzene
(D) Isopropyl chloride

Answer

Answer: (a)

2. The increasing order of nucleophilicity would be?
(A) Cl^– < Br^– < I^–
(B) I^– < Cl^– < Br^–
(C) Br^– < Cl^– < F^–
(D) I^– < Br^– < Cl^–

Answer

Answer: (a)

3. Which of the following is most reactive towards SN1 reaction?
(A) C₆H₅C(CH₃)C₆H₅Br
(B) C₈H₅CH₂Br
(C) C₆H₅CH(C₆H₅)Br
(D) C₆H₅CH(CH₃)Br

Answer

Answer: (a)

4. CH₃CH₂CH₂Br + NaCN → CH₃CH₂CH₂CN + NaBr, will be fastest in
(A) ethanol
(B) methanol
(C) N, N-dimethylformamide
(D) Water

Answer

Answer: (c)

5. A Grignard reagent may be made by reacting magnesium with
(A) Methyl amine
(B) Diethyl ether
(C) Ethyl iodide
(D) Ethyl alcohol

Answer

Answer: (c)

6. C-Cl bond of chlorobenzene in comparison to C-Cl bond in methyl chloride is
(A) Longer and weaker
(B) Shorter and weaker
(C) Shorter and stronger
(D) Longer and stronger

Answer

Answer: (c)

7. A solution of (+) 2-chloro-2-phenylethane in toluene racemises slowly in the presence of a small amount of SbCl₅, due to the formation of
(A) carbanion
(B) carbene
(C) free radical
(D) carbocation

Answer

Answer: (d)

8. The decreasing order of boiling points of alkyl halides is
(A) RF > RCl > RBr > RI
(B) RBr > RCl > RCl > RF
(C) RI > RBr > RCl > RF
(D) RCl > RF > RI > RBr

Answer

Answer: (c)

9. Phosgene is commonly known as
(A) thionyl chloride
(B) carbonyl chloride
(C) carbon dioxide and phosphine
(D) phosphoryl chloride

Answer

Answer: (b)

10. The reaction of tert butyl bromide with sodium methoxide produces mainly
(A) isobutane
(B) isobutylene
(C) tert-butyl methyl ether
(D) sodium tert butoxide

Answer

Answer: (b)