Question

Which is the LUMO of $O_2$ molecule?

• A. $2p\sigma$
• B. $2p\pi$
• C. $2p{\sigma }^{\ast }$
• D. $2p{\pi }^{\ast }$

Answer 1

The correct option is C $2p{\sigma }^{\ast }$

LUMO is lowest unoccupied molecular orbital, from the diagram we can see that ${\sigma }^{\ast }2p$ is LUMO.