Chemistry - CHEMICAL BONDING Question with Solution | TestHub

All the molecules have $\mathrm{O}$ atom with lone pairs, but in ${\mathrm{H}}_2\mathrm{O}$ the $\mathrm{H}$ atom has no vacant orbital for $\pi$ bonding. That's why it does not have any $\pi$ bond. In all other given molecules, the central atom because of the presence of vacant orbitals is capable to farm $\pi$ bonds.