Answer
Lone pairs have no effect on the shape.
Work Step by Step
HCN has a linear geometry and therefore lone pairs cannot affect the shape of the molecule.
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 9 - Molecular Geometry and Bonding Theories - Exercises - Page 390: 9.19d
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