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

Vedclass · Accepted Answer

$1,4-$dichlorobenzene

Vedclass · Answer

(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.

List-$I$	List-$II$
$(1)$ ${\rm{HBr}}$	$(A)$ $0.23$
$(2)$ ${{\rm{H}}_2}{\rm{S}}$	$(B)$ $1.04$
$(3)$ ${\rm{N}}{{\rm{F}}_3}$	$(C)$ $1.07$
$(4)$ ${\rm{CC}}{{\rm{l}}_4}$	$(D)$ $0.79$
$(5)$ ${\rm{CHC}}{{\rm{l}}_3}$	$(E)$ $0.00$
	$(F)$ $0.95$

Which of the following molecules has a zero dipole moment?

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