Column - I Column - II (P) Aromatic compound (Q) DBE ≥ 2 (R) highest C–N bond order (S) highest resonance energy (T) compound which has at least one lone pair.

Engineering

Chemistry

Aromaticity

Resonance Energy

Resonance and Bond Order

Question

Column - I	Column - II
	(P) Aromatic compound
	(Q) DBE ≥ 2
	(R) highest C–N bond order
	(S) highest resonance energy
	(T) compound which has at least one lone pair.

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This question tests aromaticity, DBE (Double Bond Equivalent), bond order, resonance energy, and lone pairs in nitrogen heterocycles.

Aromatic compounds follow Hückel's rule (4n+2 π-electrons), are planar, and cyclic. DBE is calculated as: $DBE = C - \frac{H}{2} - \frac{X}{2} + \frac{N}{2} + 1$ , where C, H, X, N are atoms. Higher bond order indicates more double bond character. Resonance energy measures stability from delocalization.

Final Answer: The correct matches are determined by analyzing each structure's properties against the given criteria (P, Q, R, S, T).