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The order of stability of the following ...

The order of stability of the following carbocations is
`underset(I)(CH_(2)=CH-overset(+)(C)H_(2)) , underset(II)(CH_(3)-CH_(2)-overset(+)(C)H_(2))`,

A

`III gt I gt II`

B

`III gt II gt I`

C

`II gt III gt I`

D

`I gt II gt III`

Text Solution

Verified by Experts

The correct Answer is:
A
In benzyl cation (III), +ve charge is dispersed through resonace over 7 carbon atoms while in allyl cation (I), it is dispersed over only three carbon atoms, therefore, cation (III) is more stable than (I). The n-propyl carbocation (II) is stabilized only by the weak +I -effect of the `CH_(3)CH_(2)` group and hence it is least stable of the three carbocations. Thus, option (a), i.e., `III gt I gt II`.
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