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What is the correct order of decreasing ...

What is the correct order of decreasing stability of the following cations?
`underset(I)(CH_(3)-overset(+)(C)H-CH_(3))" "underset(II)(CH_(3)-overset(+)(C)H-OCH_(3))`
`underset(III)(CH_(3)-overset(+)(C)H-CH_(2)-OCH_(3))`

A

(i) > (ii) > (iii)

B

(ii) gt (i) gt (iii)

C

(ii) gt (iii) gt (i)

D

(iii) gt (i) gt (ii)

Text Solution

Verified by Experts

The correct Answer is:
B
The dispersal of the charge stabilizes the carbocation. More the number of electron donating groups are present, greater the dispersal of positive charge and therefore more the stability of carbocation can be observed.
So, the order is
`CH_(3)-overset(+)CH-OCH_(3) gt CH_(3) - overset(+)CH-CH_(3) gt CH_(3) - overset(+)CH-COCH_(3)`
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