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(C) The dipole moment of a molecule is non-zero if the vector sum of the individual bond dipoles is not zero.$(i)$ $p$-dichlorobenzene: The two $C-Cl$

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$ii, iii$ and $iv$

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(C) The dipole moment of a molecule is non-zero if the vector sum of the individual bond dipoles is not zero.$(i)$ $p$-dichlorobenzene: The two $C-Cl$ bonds are in opposite directions,so their dipole moments cancel out. $\mu = 0$.(ii) $p$-dimethoxybenzene: Due to the rotation of the $-OCH_3$ groups,the molecule can exist in conformations where the dipole moments do not cancel out. Thus,$\mu 
eq 0$.(iii) $p$-dihydroxybenzene (hydroquinone): Similar to $p$-dimethoxybenzene,the rotation of the $-OH$ groups results in a non-zero net dipole moment. $\mu 
eq 0$.(iv) $SF_4$: It has a see-saw geometry with a lone pair on the sulfur atom. The molecule is asymmetric,so the dipole moments do not cancel out. $\mu 
eq 0$.Therefore,species (ii),(iii),and (iv) have non-zero dipole moments.

In which of the following species is the dipole moment non-zero?

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