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  4. The bond order of CO molecule is

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Q. The bond order of $CO$ molecule is

WBJEEWBJEE 2010Chemical Bonding and Molecular Structure

Solution:

$CO (6+8=14) \sigma(1 s)^{2}, \sigma^{*}(1 s)^{2}, \sigma(2 s)^{2},\sigma^{*}(2 s)^{2}, \pi\left(2 p_{x}\right)^{2} \approx \pi\left(2 p_{y}\right)^{2}, \sigma\left(2 p_{z}\right)^{2}$
$B \cdot O =\frac{N_{b}-N_{a}}{2}$
$=\frac{10-4}{2}=3$