Question

Which of the following compound(s) show dipole moment?

• A. $1,4$-dichlorobenzene
• B. $1,2$-dichlorobenzene
• C. $1,3$-dichlorobenzene
• D. trans-$2,3$-dicholoro-$2$-butene

Answer 1

Answer: (B), (C)

The correct options are
B $1,2$-dichlorobenzene
C $1,3$-dichlorobenzene

Dipole moment is shown by $1,2$-dichlorobenzene ($2.54D$) and $1,3$-dichlorobenzene $\left(1.48D\right)$ as individual bond dipoles reinforce. $1,4$-dichlorobenzene and trans $2,3$-dicholoro-$2$-butene have zero dipole moment as individual bond dipoles cancel each other.