JEE Main Chemistry question

The correct decreasing order of first ionisation enthalpies of five elements of the second period is [Kerala CEE 2011]

(A)
(B)
(C)Correct
(D)

Answer: (C)

Solution

Approximate values (kJ/mol): F = 1681, N = 1402, C = 1086, Be = 899, B = 801. Besides the general left-to-right increase, Be (filled ) and N (half-filled ) both show extra stability,

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Question ID VK-133188