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Question

Among the following the molecule possessing highest dipole moment is:

A
CO2
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B
BF3
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C
SO2
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D
Trans-2-butene
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Solution

The correct option is C SO2
The molecule possessing highest dipole moment is sulphur dioxide SO2. It has angular, V shaped or bent structure. The molecule is non symmetric and the individual bond dipoles do not cancel each other.
The other three molecules, CO2, BF3 and trans-2-butene have zero dipole moments due to molecular symmetry so that individual bond dipoles cancel each other.

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