Which one is most reactive towards S(N)1...

Which one is most reactive towards `S_(N)1` reactions ?

`C_(6)H_(5)CH_(2)Br`

`C_(6)H_(5)CH(C_(6)H_(5))Br`

`C_(6)H_(5)CH(CH_(3))Br`

`C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br`

Text Solution

Verified by Experts

The correct Answer is:

Reactivity in `S_(N)1` reactions depends upon the stability of the carbocation intermediate. Since the stability of the carbocations increases in the order:

Therefore, the alkyl halide, `C_(6)H_(5)C(CH_(3))(C_(6)H_(5))Br,` i.e., (d) is the most reactive.

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