Question

Which of the following molecule is having shortest bond length of $C-O$ bond?

• A. $C{H}_{3}OH$
• B. $H_{2}CO$
• C. $CO$
• D. $N{a}_{2}C{O}_3$

Answer 1

The correct option is C $CO$

In $CO,C-O$ bond gets triple bond character in one of the resonating structures. So it has shortest bond length of $C-O$ bond. But in $A$ $C-O$ has single bond character. In $B$, $C-O$ bond has double character. In $D$, $C-O$ bonds have bond length greater than double bond but less than single $C-O$ bond.