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What is the correct order of decreasing ...

What is the correct order of decreasing stability of the following cations
`H_(3)C-underset((I))overset(o+)(CH)-CH_(3)` , `H_(3)C-underset((II))overset(o+)(CH)-OMe`
`H_(3)C-underset((III))overset(o+)(CH)-CH_(2)-OMe`

A

`II gt I gt III`

B

`II gt III gt I`

C

`III gt I gt II`

D

`I gt II gt III`

Text Solution

Verified by Experts

The correct Answer is:
A
`CH_2 underset(I)to overset(+) CH larr CH_3" "`Stabilized by weak `+I` effect of two methyl groups
`CH_3 - underset(II) overset(+) CH - overset(..)O- CH_3" "` Stabilized by strong +R effect of the `- OCH_3`, group
`CH_3 - underset(III)overset(+) CH to CH_2 to OCH_3" "` Destabilized by-I effect of `- OCH` group
Thus, the correct order of stability of carbocation decreases as `II gt I gt III`
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