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(B) molecule exhibits a non-zero dipole moment if it is polar,meaning the vector sum of its bond dipoles is not zero.$1$. $1,4-$dichlorobenzene is a s

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$1,2-$dichlorobenzene

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(B) molecule exhibits a non-zero dipole moment if it is polar,meaning the vector sum of its bond dipoles is not zero.$1$. $1,4-$dichlorobenzene is a symmetric molecule where the two $C-Cl$ bond dipoles are equal and opposite,canceling each other out (dipole moment = $0 \ D$).$2$. $1,2-$dichlorobenzene has the two $Cl$ atoms on adjacent carbons,resulting in a net dipole moment due to the angular arrangement of the bonds.$3$. $trans-1,2-$dichloroethene is a centrosymmetric molecule where the bond dipoles cancel each other out (dipole moment = $0 \ D$).$4$. $trans-2-$butene is a non-polar hydrocarbon with negligible dipole moment.Therefore,$1,2-$dichlorobenzene is the correct answer.

Which of the following compounds exhibits a non-zero dipole moment?

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