Which molecule is polar?

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Question

(C) molecule is polar if its net dipole moment is non-zero $(\mu 
eq 0)$.In $1,4$-dichlorobenzene,$1,4$-dicyanobenzene,and $1,4$-dinitrobenzene,the s

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$1,4-$dihydroxybenzene

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(C) molecule is polar if its net dipole moment is non-zero $(\mu 
eq 0)$.In $1,4$-dichlorobenzene,$1,4$-dicyanobenzene,and $1,4$-dinitrobenzene,the substituents are identical and placed at para positions,leading to a symmetric structure where the dipole moments cancel out,resulting in $\mu = 0$ (non-polar).In $1,4$-dihydroxybenzene (hydroquinone),the molecule is non-planar due to the orientation of the $-OH$ groups,which prevents the dipole moments from cancelling out completely,resulting in a non-zero net dipole moment $(\mu 
eq 0)$. Thus,it is polar.

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