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  4. The correct order of leaving group ability in nucleophilic substitution reaction is

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Q. The correct order of leaving group ability in nucleophilic substitution reaction is

Haloalkanes and Haloarenes

Solution:

The leaving group ability decreases as the basicity of the nucleophile increases. Since the basicity increases in the order: $Br^{-} < Cl^{-} < CH_3COO^{-} < HO^{-} < H^{-}$, therefore, their leaving group ability decreases in the reverse order, i.e., $Br^{-} > Cl^{-} > CH_3COO^{-} > HO^{-} > H^{-} $. Thus, option (a) is correct.