Which of the following molecules has a zero d | vedclass

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(B) The dipole moment of a molecule is zero if the vector sum of the individual bond dipoles is zero. This typically occurs in symmetric molecules whe

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$1,4-$dichlorobenzene

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(B) The dipole moment of a molecule is zero if the vector sum of the individual bond dipoles is zero. This typically occurs in symmetric molecules where the bond dipoles cancel each other out.$1.$ In $1,4$-dihydroxybenzene,the two $-OH$ groups are at the para positions. Due to the rotation of the $-OH$ groups,the bond dipoles do not perfectly cancel out,resulting in a non-zero dipole moment.$2.$ In $1,4$-dichlorobenzene,the two $C-Cl$ bonds are at $180^{\circ}$ to each other. Since the $C-Cl$ bond dipoles are equal in magnitude and opposite in direction,they cancel each other out,resulting in a net dipole moment of zero.$3.$ In $4$-nitrophenol,the $-OH$ and $-NO_2$ groups are at the para positions. Since these groups have different electronic effects and different bond dipole magnitudes,they do not cancel out,resulting in a non-zero dipole moment.Therefore,only $1,4$-dichlorobenzene has a zero dipole moment.

Which of the following molecules has a zero dipole moment?

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