Chemistry: The Central Science (13th Edition)

Published by Prentice Hall
ISBN 10: 0321910419
ISBN 13: 978-0-32191-041-7

Chapter 9 - Molecular Geometry and Bonding Theories - Exercises - Page 389: 9.14b

Answer

BF$_3$ is the flat molecule.

Work Step by Step

Trigonal planar molecules exist in one plane. This is due to the absence of lone pairs. Due to its lone pairs, the nitrogen in NH$_3$ exists in another plane from the hydrogens it is attached to.
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