Answer
Due to electronegativity
Work Step by Step
In $Cl_{2}$, both atoms are from same element, so there is no electronegativity difference, hence it is non-polar. In HCl, there is electronegativity difference between H and Cl, so it is polar.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 6 - Section 6.7 - Shapes and Polarity of Molecules - Questions and Problems - Page 196: 6.67
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