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Which is the decreasing order of stabili...

Which is the decreasing order of stability
(i) `CH_(3)-overset(+)(CH)-CH_(3)`
(ii) `CH_(3)-overset(+)(CH)-O-CH_(3)`
(iii) `CH_(3)-overset(+)(CH)-CO-CH_(3)`

A

`(i) lt (ii) lt (iii)`

B

`(ii) lt (i) lt (iii)`

C

`(iii) gt (ii) gt (i)`

D

`(ii) gt (iii) gt (i)`

Text Solution

Verified by Experts

The correct Answer is:
B
`CH_(3) - overset(+)( C) H- OCH_(3)` is resonance stabilised as
Due to such resonance stability, the formed carbocation is most stable among all the given carbocations.
`CH_(3) - overset(+) ( C) H- CH_(3)` is less stable than earlier but more stable than `CH_(3) - CH - overset(O)overset(||) (C ) - CH_(3)`
Hence the correct order is
`(ii) gt (i) gt (iii)`.
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