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Question

Which of the following molecules will not have a dipole moment?

A
CH3Cl
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B
trans CHCl=CHCl
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C
CH2Cl2
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D
CCl2=CH2
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Solution

The correct option is B trans CHCl=CHCl
In trans-1,2-dichloroethane, the dipole vectors of two CCl bonds are equal in magnitude and opposite in direction. Hence, they cancel each other.
Similarly the dipole vectors of two CH bonds are equal in magnitude and opposite in direction. Hence, they cancel each other.
Thus the molecule has no net dipole moment.

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