Question

comper dipole moment of NH3 moules with that of NF3 moules ​

Answer 1

Answer:

ANSWER

The net dipole moment of NF

3

is less than that of NH

3

.

In both molecules i.e., NH

3

and NF

3

, the central atom (N) has a lone pair electron and there are three bond pairs. Hence, both molecules have a pyramidal shape.

Since fluorine is more electronegative than hydrogen, it is expected that the net dipole moment of NF

3

is greater than NH

3

. However, the net dipole moment of NH

3

is greater than that of NF

3

.

In case of NF

3

, fluorine is more electronegative than nitrogen, so it will attract the shared pair of electron towards itself from nitrogen. As a result dipole due to all F is in opposite direction to the resultant dipole due to N−F bonds, therefore the net dipole decreases.

In NH

3

, Nitrogen is more electronegative than H, so it will attract the shared pair of electrons towards itself. As a result dipole due to Nitrogen is in same direction as the resultant dipole moment due to N−H bond and hence the net dipole increases.

Hence, the net dipole moment of NF

3

is less than that of NH

3

.