NEET 2006 Chemistry question

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of (1.5 D) is larger than that of (0.2 D). This is because:-

(1)In as well as in the atomic dipole and bond dipole are in the same direction
(2)In the atomic dipole and bond dipole are in the same direction whereas in these are in opposite directionsCorrect
(3)In as well as the atomic dipole and bond dipole are in opposite directions
(4)In the atomic dipole and bond dipole are in the opposite directions whereas in these are in the same direction

Answer: (2)

Solution

Both molecules are pyramidal with a lone pair on N, which gives an "atomic (lone-pair) dipole" directed away from the nucleus along the axis. In , N is more electronegative than H, so the N-H bond dipoles point towards N; their resultant lies in the same direction as the lone-pair dipole, so the two add

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Question ID VK-089624