A) \[C{{H}_{3}}Cl\]
B) \[C{{H}_{3}}C{{H}_{2}}Cl\]
C) \[{{(C{{H}_{3}})}_{2}}CHCl\]
D) \[{{(C{{H}_{3}})}_{3}}C-Cl\]
Correct Answer: A
Solution :
[a] \[{{S}_{N}}2\] mechanism is favoured maximum in methyl chloride among all the given options. Difference in rates are related to the bulk of the substituents. As the number of substituents attached to carbon bearing the halogen is increased, the reactivity towards \[{{S}_{N}}2\] substitution decreases. The order of reactivity towards \[{{S}_{N}}2\] mechanism is \[C{{H}_{3}}Cl>C{{H}_{3}}C{{H}_{2}}Cl>{{(C{{H}_{3}})}_{2}}CHCl\]\[>{{(C{{H}_{3}})}_{3}}CCl\]
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