Question: The decreasing order of reactivity of the following compounds towards nucleophilic substitution $\left(\mathrm{S}_{\mathrm{N}}^{2}\right)$ is :
$(\mathrm{IV})>(\mathrm{II})>(\mathrm{III})>(\mathrm{I})$
(II) $>$ (III) $>$ (IV) $>$ (I)
(II) $>$ (III) $>$ (I) $>$ (IV)
(III) $>$ (II) $>$ (IV) $>$ (I)
Correct Option: , 2
Solution:
