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Q.
Which of the following molecules has the maximum dipole moment?
J & K CETJ & K CET 2013Chemical Bonding and Molecular Structure
Solution:
$CO _{2}$ and $CH _{4}$ have zero dipole moment as these are symmetrical in nature. Between $NH _{3}$ and $NF _{3}$, $NF _{3}$ has greater dipole moment though in $NH _{3}$ and $NF _{3}$ both, $N$ possesses one lone pair of electrons.
This is because in case of $NH _{3}$, the net $N - H$ bond dipole is in the same direction as the direction of dipole of lone pair but in case of $NF _{3}$, the direction of net bond dipole of three $- N - F$ bonds is opposite than that of the dipole of the then lone pair.
