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  4. The order of reactivity of various alkyl halides towards nucleophilic substitution follows the order

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Q. The order of reactivity of various alkyl halides towards nucleophilic substitution follows the order

Haloalkanes and Haloarenes

Solution:

The alkyl halides are very reactive due to highly polarised $C$-$X$ bond with a large difference in electronegativities of carbon and halogen atoms. The order of reactivity is
iodides > bromides > chlorides > fluorides.