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  4. The correct decreasing order of reactivity for a given alkyl (R) group in both SN1 and SN2 reaction mechanisms is

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Q. The correct decreasing order of reactivity for a given alkyl $(R)$ group in both $S_N1$ and $S_N2$ reaction mechanisms is

KEAMKEAM 2014Haloalkanes and Haloarenes

Solution:

With increase in the size of halogen atom in $R-X, $ (where $X=$ halogen) bond length increases or $R-X$ bond strength decreases. Thus, rate of reaction in $S _{ N } 1$ as well as $S _{ N }^{2}$ reaction increases. The order of size of halogen atom is

$I > Br > Cl > F$

Thus, the order of reactivity is

$R- I >R- Br >R- Cl >R- F$