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  4. For the following compounds, the correct statement(s) with respect to nucleophilic substitution reactions is(are)

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Q. For the following compounds, the correct statement(s) with respect to nucleophilic substitution reactions is(are)Chemistry Question Image

JEE AdvancedJEE Advanced 2017Haloalkanes and Haloarenes

Solution:

Benzylic and $3^{\circ}$ halides both follow $S _{ N } 1$ mechanism.
Benzylic and $1^{\circ}$ halides both follow $S_{N } 2$ mechanism.
Benzylic $2^{\circ}$ halides can undergo inversion of configuration.
The order of reactivity would be $I V > I > III$ if both $S _{ N } 1$ and $S _{ N } 2$ are considered suitably for substrates.