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

Step-by-step solution

C 2 = 12 ; σ 1 s 2 < σ * 1 s 2 < σ 2 s 2 < σ * 2 s 2 < π 2 p x 2 = π 2 p y 2 So according to MOT, the orbitals involved in bonding are only pie orbital. Hence C 2 contains only π bonds.