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 391: 9.51a

Answer

It will be $SP_2$ hybridized.

Work Step by Step

The Boron atom will form a single bond with each Chlorine atom, leaving no lone pairs on the Boron. Because Boron has 3 electron domains (3 bonded pairs and no lone pairs of electrons), it must be $SP_2$ hybridized.
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