Which one of the following compounds is more reactive towards $S_{N} 2$ reaction and why?
$C H_{3} C H (C l) C H_{2} C H_{3}$ and $C H_{3} C H_{2} C H_{2} C l$

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Solution

Primary alkyl halides are more reactive towards $S N^{2}$ reaction because primary alkyl halides are less hindered by alkyl groups rather than $2^{\circ}$ or $3^{\circ}$ alkyl halide which are having one more bulky groups which create hinderance for halogen to get detached.
Hence the second compound is more reactive towards $S N^{2}$ reaction.

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