Question

The bond order of CO molecule is

• A. $2$
• B. $2.5$
• C. $3$
• D. $3.5$

Answer 1

The correct option is C $3$

$CO(6+8=14)\sigma (1s{)}^2,{\sigma }^{\star }(1s{)}^2,\sigma (2s{)}^2,{\sigma }^{\star }(2s{)}^2,\pi (2p_x{)}^2\approx \pi (2p_y{)}^2,\sigma (2p_z{)}^2$

$B.O=\frac{N_b-N_a}{2}=\frac{10-4}{2}=3$