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(C) $BF_3$ and $B_2H_6$ are non-polar molecules and have a net dipole moment of $0 \ D$.In $NF_3$,the highly electronegative $F$ atoms pull the electr

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$NH_3$

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(C) $BF_3$ and $B_2H_6$ are non-polar molecules and have a net dipole moment of $0 \ D$.In $NF_3$,the highly electronegative $F$ atoms pull the electron density away from the $N$ atom,such that the resultant dipole moment of the three $N-F$ bonds opposes the dipole moment of the lone pair on the $N$ atom.In $NH_3$,the dipole moments of the three $N-H$ bonds are in the same direction as the dipole moment of the lone pair on the $N$ atom.Therefore,the bond moments add up in $NH_3$,resulting in the highest dipole moment among the given options.

Which of the following molecules has the highest dipole moment?

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