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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb015

Hydrazoic acid is written as $H - N = N X^{+} = N X^{-}$ . The number of sigma bonds, the number of pi bonds and the total number of lone pairs in this structure are, respectively,

A3, 2, 3
B3, 2, 4
C2, 3, 3
D3, 3, 2

Answer: A

Bonds: H-N, N=N, N=N give 3 sigma bonds; the two double bonds give 2 pi bonds. Lone pairs: the NH nitrogen has 1, the central

N X^{+}

has 0, the terminal

N X^{-}

has 2, so the total is 3.

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