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  4. Reactivity order of halides for dehydrohalogenation is :-

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Q. Reactivity order of halides for dehydrohalogenation is :-

AIPMTAIPMT 2002Haloalkanes and Haloarenes

Solution:

Reactivity of $R-X$ depends on bond length.

More be the bond length, easier for the $R-X$ to go for dehydrohalogenation.

Thus, correct order is :

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