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The correct decreasing order of reactivi...

The correct decreasing order of reactivity for a given alkyl (R) group in both `S _(N)1 and S_(N) 2` reaction mechanisms is

A

`R - I gt R - Br gt R - Cl gt R - F`

B

`R - I gt R - Cl gt R - Br gt R - F`

C

`R - F gt R - Cl gt - Br gt R - l`

D

`R - F gt R - l gt R - Cl gt R - Br`

Text Solution

Verified by Experts

The correct Answer is:
A
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 gt Br gt Cl gt F`
Thus, the order of reactivity is
`R - I gt R - Br gt R gt Cl gtR - F`
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