Question

The dipole moment of ${NH}_3$ is ____ than that of ${NF}_3$.

• A. less
• B. more
• C. equal
• D. none

Answer 1

The correct option is B more

The dipole moment of ${NH}_3$ acts in the directions $H⟶N$ and thus moment due to unshared pair of electron will naturally increase the moment of the ${NH}_3$ molecule while in the case of ${NF}_3$, the dipole moment acts in the direction $N⟶F$ and thus unshared electron pair will partially neutralize the dipole moment, causing a lower moment of ${NH}_3$ relative of ${NH}_3$