For which of the following molecules is the d | vedclass

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(D) For $p$-dichlorobenzene $(i)$ and $p$-dicyanobenzene $(ii)$,the dipole moments of the individual bonds cancel each other out because they are equa

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$(iii)$ and $(iv)$

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(D) For $p$-dichlorobenzene $(i)$ and $p$-dicyanobenzene $(ii)$,the dipole moments of the individual bonds cancel each other out because they are equal in magnitude and opposite in direction. Hence,the resultant dipole moment of these molecules is zero.For $p$-hydroquinone $(iii)$ and $p$-benzenedithiol $(iv)$,the $O-H$ and $S-H$ bond dipoles do not cancel each other out because they are not in opposite directions due to the existence of different conformations. Hence,the resultant dipole moment of these molecules is non-zero $(\mu 
e 0)$.

For which of the following molecules is the dipole moment $\mu \ne 0$?

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