Organic Chemistry (8th Edition)

Published by Pearson
ISBN 10: 0321768418
ISBN 13: 978-0-32176-841-4

Chapter 4 - The Study of Chemical Reactions - Problems - Page 164: Problem 4-29 c

Answer

The order of stability of the carbocations is : most stable $(d) \gt (c) \gt (b) \gt (a)$ least stable. The carbocation $(c)$ is a tertiary ($3^{\circ}$) carbocation.

Work Step by Step

The carbocation (d) is $3^{\circ}$ and resonance stabilized, so it is the most stable. $(c)$ is also tertiary, so it is the next most stable. $(b)$ is secondary, it is the next stable carbocation. $(a)$ is a primary carbocation, so it is the least stable.
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