Question

Dipole moment is shown by :

• A. 1, 4-dichloro benzene
• B. cis-1, 2-dichloro ethene
• C. trans-1, 2-dichloro ethene
• D. trans-1, 2-dichloro-2-pentene

Answer 1

Answer: (B), (D)

The correct options are
B cis-1, 2-dichloro ethene
D trans-1, 2-dichloro-2-pentene

A) (1, 4 -dichloro Benzene) No dipole moment symmetry molecule.
B) Cis-1, 2-dichloroethane has dipole moment.

C) Trans-1, 2-dichloroethene.
zero dipole moment, since the molecule is symmetric.

D) Trans -1, 2-dichloro-2-pentene.
has a dipole moment and the molecule is not symmetric.

In (A) and (C), two chlorine atoms are present oppositely, and thus dipole moment is canceled by each other.