Answer
$NH_{3}$ has a lone pair of electrons, which it can donate for bonding, hence it can serve as a ligand, while $BH_{3}$ has no lone pair of electrons, hence it can not serve as ligand.
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Given above
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 23 - Transition Metals and Coordination Chemistry - Exercises - Page 1033: 23.21c
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