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Q.
Which is the correct decreasing order of reactivity towards $SN_2$ displacement of the following compounds?
Haloalkanes and Haloarenes
Solution:
Since in case of $1^{\circ}$ alkyl halides, steric hindrance increases in the order : $n$ -alkyl halides, alkyl halide with a substituent at any position other than the $\beta$ -position, one substituent at the $\beta$ -position, two substituents at the $\beta$ -position, therefore, the reactivity decreases in the same order. Thus, the reactivity of the given alkyl bromides decreases in the order:
1-Bromobutane $>1$ -Bromo-3-methylbutane $>1$ -Bromo-2methylbutane $>1$ -Bromo-2,2-dimethylpropane.
