Question

Which of the following diatomic molecular species has only $\pi$ bonds according to Molecular Orbital Theory ?

• A. $C_2$
• B. $B{e}_2$
• C. $O_2$
• D. $N_2$

Answer 1

Answer: (A)

MO configuration $C_2$ is :
$\sigma 1s^2,{\sigma }^{\ast }1s^2,\sigma 2s^2,{\sigma }^{\ast }2s^2,\pi 2p_x^2=\pi 2p_y^2$