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Q.
Which of the following alkyl halides is hydrolysed by $ {{S}_{N}}2 $ mechanism?
BVP MedicalBVP Medical 2010
Solution:
$ {{S}_{N}}2 $ mechanism involves the back side attack and formation of a transition state, thus less hindered alkyl halide readily undergoes $ {{S}_{N}}2 $ mechanism. Among the given, $ C{{H}_{3}}Br $ (methyl bromide) is less hindered, thus hydrolysed by $ {{S}_{N}}2 $ mechanism.