Question

Draw the MO diagram for acetylide ion C₂^2- and calculate its bond order.

Answer 1

Acetylide ion, C₂^2- in acetylene

Electronic configuration of C² ion is:

σ1s² σ*1s² σ1s² π2p_x² π2p_y²

Bond order = \(\frac{N_b-N_a}{2}\) = \(\frac{8-4}{2}\) = 2