Q45 / 180 · NEET 2019 (All India) · Chemistry

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

Solution

$C_{2} = (12);$ $σ 1 s^{2} < \overset{*}{σ} 1 s^{2} < σ 2 s^{2} < \overset{*}{σ} 2 s^{2} < π 2 p_{x}^{2} = π 2 p_{y}^{2}$

So according to MOT, the orbitals involved in bonding are only pie orbital.

Hence $C_{2}$ contains only $π$ bonds.

Hence, the correct answer is option: 'C'.