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Consider the following carbocations (I...

Consider the following carbocations
(I)`C_(6)H_(5)overset(+)CH_(2)` , (II)`C_(6)H_(5)CH_(2)overset(+)CH_(2)`
(III)`C_(6)H_(5)overset(+)CHCH_(3)` , (IV) `C_(6)H_(5)overset(+)C(CH_(3))_(2)`
The correct sequence for the stability of these is

A

`IIltIltIIIltIV`

B

`IIltIIIltIltIV`

C

`IIIltIltIIltIV`

D

`IVltIIIltIltII`

Text Solution

Verified by Experts

The correct Answer is:
A
IV is stabilised by +I effect of two `CH_(3)` groups and by dispersal of + ve charge on the benzene ring by resonance.
III is stabilized by + I effect of one `CH_(3)` group and by dispersal of + ve charge on the benzene ring.
I is stabilized by dispersal of +ve charge on the benzene ring.
II is not stabilized by any of the above factors `therefore `over all order of stability is `IIltIltIII ltIV` Hence (A) is correct.
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DINESH PUBLICATION-BASIC PRINCIPLES OF ORGANIC CHEMISTRY-REVISION QUESTIONS FROM COMPETITIVE EXAMS.
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