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4.23 Which out of and
has higher dipole moment and why ?
Answers (1)
Here both have central atom Nitrogen and it has a lone pair of electrons with three bond pairs.
Hence both molecules have a pyramidal shape.
The electronegativity of fluorine is more as compared to the hydrogen. Hence it is expected that the net dipole moment of is greater than
.
However has the net dipole moment of 1.46D and
has the net dipole moment of 0.24D. which is greater than
.
This is because of the direction of the dipole moments of each individual bond in and
.
The moments of the lone pair in partly cancel out. But in
the resultant moment add up to the bond moment of the lone pair.
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