Which of the following will have zero dipole moment?

Cis-1, 2-dicholroethene

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Trans-1,2-dichloroethene

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Dichloromethane

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o-Phenylene dichloride

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Solution

The correct option is C Trans-1,2-dichloroethene
The trans form has zero dipole moment.

The vectors due to $(C - C l)$ and $(C - H)$ are equal and opposite and cancel each other ( $μ =$ 0).

Option B is correct.

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