Which has maximum dipole moment?

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(A) The dipole moment of a molecule depends on the vector sum of the individual bond dipoles. For $1,4$-dichlorobenzene,the two $C-Cl$ bond dipoles ar

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$1,2,4-$trichlorobenzene

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(A) The dipole moment of a molecule depends on the vector sum of the individual bond dipoles. For $1,4$-dichlorobenzene,the two $C-Cl$ bond dipoles are equal and opposite,so they cancel each other out,resulting in a net dipole moment of $0 \ D$. For $1,3,5$-trichlorobenzene,the three $C-Cl$ bond dipoles are oriented at $120^{\circ}$ to each other,and their vector sum is also $0$. For $1,2,3$-trichlorobenzene,the dipole moments of the two outer $Cl$ atoms partially cancel the dipole of the middle $Cl$ atom,but there is a significant net dipole. For $1,2,4$-trichlorobenzene,the arrangement of $Cl$ atoms leads to a larger resultant dipole moment compared to the others because the vectors do not cancel out as effectively. Thus,$1,2,4$-trichlorobenzene has the maximum dipole moment.

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