Answer
A
Work Step by Step
Trigonal pyramidal requires 3 atoms bonded to the central one, which all options have, and the central atom has one lone-pair, $SO_3,BCl_3$ have none, $ClF_3$ has two, only $PCl_3$ has one.
Chemistry and Chemical Reactivity (9th Edition)
by Kotz, John C.; Treichel, Paul M.; Townsend, John R.; Treichel, David A.
Published by
Cengage Learning
ISBN 10:
1133949649
ISBN 13:
978-1-13394-964-0
Chapter 8 Bonding and Molecular Structure - 8-6 Molecular Shapes - Review & Check for Section 8-6 - Page 314: 1
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