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JEE Main levelSingle correct optionDifficulty 2 of 3cb139

Which of the following has zero dipole moment?

A1,3,5-trichlorobenzene
B1,2,3-trichlorobenzene
C1,2,4-trichlorobenzene
Dchlorobenzene

Answer: A

In 1,3,5-trichlorobenzene the three C-Cl bond dipoles are at

12 0^{\circ}

to each other and cancel. The other three isomers have unsymmetrical arrangements with a non-zero resultant.

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