MCQs on Haloalkanes and Haloarenes

MCQs on Haloalkanes and Haloarenes

1. 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)

2. Which of the following undergoes nucleophilic substitution exclusively by S_N1 mechanism?

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

Answer: (a)

3. 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)

4. 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)

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

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

Answer: (c)

6. A Grignard reagent may be made by reacting magnesium with

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

Answer: (c)

7. 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)

8. 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

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

Answer: (d)

9. The decreasing order of boiling points of alkyl halides is

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

Answer: (c)

10. Phosgene is commonly known as

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

Answer: (b)