Which of the follwing undergoes fastest ...

Which of the follwing undergoes fastest dehydrohalogention ?

A

`CT_(3)CH_(2)I`

B

`CD_(3)CH_(2)I`

C

`CH_(3)CH_(2)I`

D

All are equally reactive

Text Solution

Verified by Experts

The correct Answer is:

C

`E2` elimination shows a large hydrogen isotope effect. The heavier the isotope, the slower the reaction. Therefore, the order of decreasing reactivity is `3 gt 2gt 1`.

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