Organic Chemistry (8th Edition)

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

Chapter 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy - Study Problems - Page 708: 15-24 f

Answer

Cumulated at carbon 1 and 2, and conjugated at carbon 2 and 4.

Work Step by Step

It is cumulated at carbon 1 and 2 because the double bonds are not separated by any single bond. It is conjugated because the double bond at 2 and the double bond at 4 is separated by a single bond at 3.
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