A) 1-bromopentane
B) 2-bromo-2-methylbutane
C) 1-bromo-3-methylbutane
D) 1-bromo-2-methylbutane
Correct Answer: B
Solution :
The least reactive bromide in a \[{{\text{S}}_{\text{N}}}\text{2}\]reaction is 2-bromo-2-methyl butane\[C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{Br}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-C{{H}_{2}}C{{H}_{3}}\]because it is a tertiary \[\text{(}{{\text{3}}^{\text{o}}}\text{)}\]alkyl halide and it mainly undergoes \[{{\text{S}}_{\text{N}}}\text{1}\]reaction.
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