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\[{{S}_{N}}2\]reaction is 2-bromo-2-methyl butane \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \end{smallmatrix}}{\overset{\begin{smallmatrix} Br \\ | \end{smallmatrix}}{\mathop{C}}}\,-C{{H}_{2}}C{{H}_{3}}\]because it is a tertiary\[(3{}^\circ )\]alkyl halide and it mainly undergoes\[{{S}_{N}}1\] reaction.
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