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Which of the following presents the correct order of second ionization enthalpies of C, N, O and F?

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$O > N > F > C$

$F > O > N > C$

$C > N > O > F$

$O > F > N > C$

answer is D.

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Detailed Solution

IE of M = $I E_{1} o f M^{+}$

$\begin{array}{l} C^{+} & N^{+} & O^{+} & F^{+} \\ 2 p^{1} & 2 p^{2} & 2 p^{3} & 2 p^{4} \end{array}$

The correct order of second ionization enthalpy is: C < N < F < O

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