JEE Main 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:

(A)In as well as the atomic dipole and bond dipole are in opposite directions
(B)In the atomic dipole and bond dipole are in opposite directions, whereas in these are in the same direction
(C)In as well as in the atomic dipole and bond dipole are in the same direction
(D)In the atomic dipole and bond dipole are in the same direction, whereas in these are in opposite directionsCorrect

Answer: (D)

Solution

The lone pair on N creates an "atomic dipole" pointing away from the three substituents (toward the lone pair). In , the N–H bond dipole points from H toward N (N is more electronegative), which is the same general direction as the atomic dipole — the two reinforce, giving a sizeable

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Question ID VK-133703