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Which of the following compounds has a zero dipole moment?

1. 1,1 - Dichloroethylene
2. cis-1,2-Dichloroethylene
3. trans- 1,2 - Dichloroethylene
4. None of the above

Correct answer: trans- 1,2 - Dichloroethylene

Solution

In trans-1,2-dichloroethylene, the two polar C–Cl bond dipoles are arranged symmetrically on opposite sides of the double bond, so they cancel. The cis isomer and 1,1-dichloroethylene both have an অসমmetrical dipole arrangement, giving a net dipole moment.

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