Which one of the following molecules contains no `pi` - bond ?

Options

A. `CO_2`
B. `H_2O`
C. `SO_2`
D. `NO_2`

Answer

B

Explanation

All the molecules have O-atom with lone pair but in `H_2O` the 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 form `pi`-bonds.