Question

An electron is removed from the highest occupied molecular orbital (HOMO) in each of the given molecules as indicated. Select the molecule in which the HOMO becomes the LUMO (Lowest unoccupied molecular orbital) after the Ionisation is done.

• A. $F_2\to F_2^{+}$
• B. $N_2\to N_2^{+}$
• C. $O_2^{+}\to O_2^{2+}$
• D. $B_2\to B_2^{+}$

Answer 1

The correct option is C $O_2^{+}\to O_2^{2+}$

$O_2^{+}$ has HOMO as ${\pi }_{2px}={\pi }_{2py}$
$O_2^{+2}$ has LUMO as ${\pi }_{2px}={\pi }_{2py}$