NEET 2014 Chemistry question

Which of the following molecules has the maximum dipole moment?

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

(linear) and (tetrahedral) are symmetrical, so their bond dipoles cancel and . and are both pyramidal. In the N-H bond dipoles (N is more electronegative) point towards N, in the same direction as

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Question ID VK-091539