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
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`
1 Answers
Correct Answer - 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.