Organic Chemistry (8th Edition)

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

Chapter 2 - Structure and Properties of Organic Molecules - Problems: Problem 2-19 c

Answer

This hydrocarbon is an alkyne. The lewis structure is shown in the picture below.
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Work Step by Step

This hydrocarbon is an alkyne because it contains a triple carbon-carbon bond. As the Lewis structure is drawn the way the formula is written, it can be seen that the second and the third carbon have only two bonds but a carbon should have four bonds. Thus, there should be a triple bond between second and third carbon. This makes it an alkyne.
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