Question

An example of $p\pi -p\pi$ bonding is:

• A. $B{F}_3$
• B. $C{O}_2$
• C. $N{H}_3$
• D. $C{H}_4$

Answer 1

The correct option is B $C{O}_2$

Central atom $C$ has singly occupied $p$ - orbitals which overlaps sidewise to form a $\pi$ bond with the singly occupied $p$ - orbitals of $O$ resulting in $p\pi -p\pi$ bonding.
Remember $p_x-p_x$ and $p_y-p_y$ will overlap to give $\pi$ bond (considering z as internuclear axis).