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  4. In the nucleophilic substitution reactions (SN 2 or SN 1) the reactivity of alkyl halides follows the sequence

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Q. In the nucleophilic substitution reactions $\left(S_{N} 2 or S_{N} 1\right)$ the reactivity of alkyl halides follows the sequence

NTA AbhyasNTA Abhyas 2022

Solution:

Nucleophilic substitution reaction depends on leaving group ability
The correct order of reactivity is
$\text{RI} \, \text{>} \, \text{RBr} \, \text{>} \, \text{RCl} \, \text{>} \, \text{RF }$
It is due to fact, that weaker the base, better will be the leaving group.
Leaving group ability $\text{I}^{-} > \text{Br}^{-} > \text{Cl} > \text{F}^{-}$