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JEE Main levelSingle correct optionDifficulty 2 of 3cb134

Cis-1,2-dichloroethene is polar whereas the trans isomer has zero dipole moment. The reason is

Athe trans isomer has a shorter C=C bond
Bthe trans isomer has no C-Cl bonds
Cthe cis isomer has a lone pair on carbon
Din the trans isomer the two C-Cl bond dipoles are equal and opposite

Answer: D

In the trans isomer the two C-Cl bond dipoles point in opposite directions and cancel. In the cis isomer they are on the same side and add to a non-zero resultant.

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