AIIMS 2018 Chemistry Resonance and Bond Lengths MCQ Question

Option D is correct because hydrazoic acid (HN₃) has a bent structure due to the presence of lone pairs on the nitrogen atoms, resulting in bond angles that deviate from linearity. In contrast, options A, B, and C are correct: (A) N₃⁻ is isoelectronic with CO₂, both having 10 electrons; (B) NH₂OH and N₃⁻ have the same oxidation number of -3 for the nitrogen atom; and (C) the N−N bond lengths in N₃⁻ are indeed similar due to resonance stabilization. Understanding molecular geometry and resonance helps clarify these distinctions.