A haloalkane is known to have an $S_{N} 2$ reaction rate 30 times faster than that of ethyl bromide. Identify the haloalkane.

Methyl bromide

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Isopropyl bromide

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tert-Butyl bromide

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neo-Pentyl bromide

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Solution

The correct option is A Methyl bromide
The presence of bulky groups around the C atom has an inhibiting effect on the rate of $S_{N} 2$ reaction. Since methyl bromide has only three H atoms around the C, it will have a higher rate than ethyl bromide.

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