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Hyperconjugation involves overlap of the...

Hyperconjugation involves overlap of the following orbitals :

A

`sigma-sigma`

B

`sigma-pi`

C

`p-p`

D

`pi-pi.`

Text Solution

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The correct Answer is:
B
(i) Carbocation (I) is stabilized by + R effect, effect of O as well as + I effect of two `-CH_(3)` groups (ii) Carbocation (II) is stabilized by + I effect of `-CH_(3)" and "-CH_(2)CH(CH_(2))_(2)` groups (iii) Carbocation (Ill), is stabilized by +R effect of O and + I effect of one `CH_(3)` group while (IV) carbocation (IV) is stabilized by + I effect of `CH_(2)CHCH(CH_(3))_(2)` group.
`therefore` the decreasing order of stability of these carbocations is `IgtIIIgtIIgtIV `.
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