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The correct order of first ionization enthalpy for the given four elements is:
Detailed Solution
C: $1s^2 2s^2 2p^2$; N: $1s^2 2s^2 2p^3$ (stable half-filled); O: $1s^2 2s^2 2p^4$; F: $1s^2 2s^2 2p^5$. IE increases across the period, but N > O due to the half-filled p subshell. Order: C < O < N < F.