Nitrogen, N$_2$, and carbon monoxide, CO, both have M$_r$ = 28.
The boiling point of N$_2$ is 77 K.
The boiling point of CO is 82 K.
What could be responsible for this difference in boiling points?
CO molecules have a permanent dipole; the N$_2$ molecules are not polar.
2 )
N$_2$ has $\sigma$ and $\pi$ bonding; CO has $\sigma$ bonding only.
3 )
N$_2$ has a strong N $\equiv$ N bond; CO has a C=O bond.
4 )
The CO molecule has more electrons than the N$_2$ molecule.
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