Question

How many orbitals are singly occupied in $O_2$ molecule?

• A. $2$
• B. $1$
• C. $3$
• D. $4$

Answer 1

Answer: (A)

$M.O.$ configuration of $O_2:$
$\left(\sigma 1s^2\right)\left({\sigma }^{\ast }1s^2\right)\left(\sigma 2s^2\right)\left({\sigma }^{\ast }2s^2\right)\left(\sigma 2P_z^2\right)\left(\pi 2p_x^2=\pi 2p_y^2\right)$
$\left({\pi }^{\ast }2p_x^1={\pi }^{\ast }2p_y^1\right)$