Haloalkanes and Haloarenes MCQ Questions Answers – Set 2

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1. Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

  1. Benzyl Chloride
  2. Ethyl chloride
  3. Chlorobenzene
  4. Isopropyl chloride

Answer: (a)

2. The increasing order of nucleophilicity would be?

  1. Cl < Br < I
  2. I < Cl < Br
  3. Br < Cl– < F
  4. I < Br < Cl

Answer: (a)

3. Which of the following is most reactive towards SN1 reaction?

  1. C6H5C(CH3)C6H5Br
  2. C8H5CH2Br
  3. C6H5CH(C6H5)Br
  4. C6H5CH(CH3)Br

Answer: (a)

4. CH3CH2CH2Br + NaCN → CH3CH2CH2CN + NaBr, will be fastest in

  1. ethanol
  2. methanol
  3. N, N-dimethylformamide
  4. Water

Answer: (c)

5. A Grignard reagent may be made by reacting magnesium with [ CBSE 2007 ]

  1. Methyl amine
  2. Diethyl ether
  3. Ethyl iodide
  4. Ethyl alcohol

Answer: (c)

6. C-Cl bond of chlorobenzene in comparison to C-Cl bond in methyl chloride is

  1. Longer and weaker
  2. Shorter and weaker
  3. Shorter and stronger
  4. Longer and stronger

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 [UP SB 2019]

  1. carbanion
  2. carbene
  3. free radical
  4. carbocation

Answer: (d)

8. The decreasing order of boiling points of alkyl halides is [ WBCHSE 2014 ]

  1. RF > RCl > RBr > RI
  2. RBr > RCl > RCl > RF
  3. RI > RBr > RCl > RF
  4. RCl > RF > RI > RBr

Answer: (c)

9. Phosgene is commonly known as

  1. thionyl chloride
  2. carbonyl chloride
  3. carbon dioxide and phosphine
  4. phosphoryl chloride

Answer: (b)

10. The reaction of tert butyl bromide with sodium methoxide produces mainly

  1. isobutane
  2. isobutylene
  3. tert-butyl methyl ether
  4. sodium tert butoxide

Answer: (b)


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