Organic Chemistry (8th Edition)

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

Chapter 6 - Alkyl Halides: Nucleophilic Substitution and Elimination - Problems - Page 224: Problem 6-5 c

Answer

$cis-$2,3-dibromobut-2-ene has the higher molecular dipole moment.

Work Step by Step

In $cis-$2,3-dibromobut-2-ene, the two $C-Br$ bonds are polar and their dipole moments are in the same direction, leading to a high molecular dipole moment. But in $trans-$2,3-dibromobut-2-ene, the dipole moments due to the polar $C-Br$ bonds are in the opposite directions and cancel out, so the effective dipole moment of the molecule is zero. So,$cis-$2,3-dibromobut-2-ene has the higher molecular dipole moment.
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