The electronegativity difference between 
and 
is greater than that between 
and 
yet the dipole moment of 
is larger than that of 
. This is because
the atomic dipole and bond dipole are in the opposite directions whereas in 
these are in the same direction
as well as in 
the atomic dipole and bond dipole are in the same direction
the atomic dipole and bond dipole are in the same direction whereas in 
these are in opposite directions
as well as in 
the atomic dipole and bond dipole are in opposite directions.
Text Solution
Verified by ExpertsC
The dipole moment of 
is 0.24 
and of 
is 1.48 D. The difference is due to fact that while the dipole moment due to N ‐ F bonds in 
are in opposite direction to the direction of the dipole moment of the lone pair on 
atom which partly cancel out, the dipole moment of N ‐ H bonds in 
are in the same direction of the dipole moment of the lone pair on 
atom which adds up as shown:
(moments subtract) 
(moments add)
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