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What is the correct order of decreasing ...

What is the correct order of decreasing stability of the following cations ?
`overset(oplus)underset(CH_(3)-CH-CH_(3)`
II `overset(oplus)underset(CH_(3)-CH-OCH_(3)`
III `overset(oplus)underset(CH_(3)-CH-CH_(2)-OCH_(3)`

A

`IIgtIgtIII`

B

`IIgtIIIgtI`

C

`IIIgtIgtII`

D

`IgtIIgtIII`

Text Solution

Verified by Experts

The correct Answer is:
A
Stability of carbocation increases with the dispersal of positive charge by the donation of eletron density through `+I` effect The groups showing `+I` effect are `-OCH_(3)-CH_(3)-CH_(2)-OCH_(3)` thus the correct stability order of the given carbocations is
`II gt I gt III`
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