First slide

Organic reagents and intermediates

Question

Arrange the following carbocations in decreasing order of stability
I. ${CH}_{3} {CH}_{2} {\overset{\oplus}{C} H}_{2}$
II.
III. ${CH}_{3} - \overset{\oplus}{C} H - {CH}_{3}$
IV.

Moderate

A

I > II > III > IV
B

IV > III > I > II
C

II > IV > III > I
D

IV > III > II > I

Solution

Resonance stabilization is seen in II. In the option II we can see that the lone pair present on the nitrogen atom participates in resonance and hence making the carbocation stablest.

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