JEE Main Chemistry question

The correct order of ionisation energy for comparing carbon, nitrogen and oxygen atom is [UP SEE 2004]

(A)C > N > O
(B)C > N < O
(C)C < N > OCorrect
(D)C < N < O

Answer: (C)

Solution

First ionisation energies are approximately C = 1086, N = 1402, O = 1314 kJ/mol. Nitrogen's extra-stable, exactly half-filled configuration makes its IE anomalously higher than oxygen's, giving the

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Question ID VK-133115