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  4. The order of reactivity of the given haloalkanes towards nucleophile is :

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Q. The order of reactivity of the given haloalkanes towards nucleophile is :

JEE MainJEE Main 2013Haloalkanes and Haloarenes

Solution:

For a given alkyl group, the order of reactivity is
$\frac{R —I> R —B r>R —C1>R —F}{increasing\, bond\, energy}$
decreasing halogen reactivity.
This order depends on the carbon-halogen bond energy; the carbon-fluorine bond energy is maximum and thus fluorides are least reactive while carbon-iodine bond energy is minimum hence iodides are most reactive.