# The correct order of ionization energy is

$(a)\;C > N > O \\(b)\; C > N < O \\ (c)\;C < N > O \\ (d)\;C < N < O$

Nitrogen has maximum ionization energy because of its half- filled electronics configuration . The correct order is $C < N > O$
Hence c is the correct answer.
edited Oct 26 by meena.p