Among 
and 
, identify the molecule 
with lowest dipole moment value. The number of lone pairs of electrons present on the central atom of the molecule 
is:
Text Solution
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Comparing dipole moments:
(bent, 2 lone pairs on S ),
(bent, 2 lone pairs on O ),
(pyramidal, 1 lone pair on N ),
(pyramidal, 1 lone pair on N ),
(tetrahedral, 0 lone pairs on C ).
has the lowest dipole moment because the highly polar N-F bonds are oriented in such a way that their contributions nearly cancel with the effect of the lone pair. The central atom in 
is N , which has 1 lone pair of electrons.
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