Q. In how many of the following, dipole moment is non-zero?
cis--dichloroethene, -dichlorobenzene,
trans--dichloroethene, -dichlorobenzene,
trans-pent--ene

 187  132 Chemical Bonding and Molecular Structure Report Error

Answer: 3

Solution:

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In and , dipole moments cancel each other and so, net dipole moment is zero.