91Ó°ÊÓ

We need to find shape of molecule according to description:

A molecule with a central atom that has four electron groups and two bonded atoms

A molecule with four electron groups on its central atom, two atoms bonded to it has two lone pairs and bond angle of $109°$. So shape of molecule is bent($109°$). Example ${\mathrm{H}}_2\mathrm{O}$. Hence. option $2$is correct.

We need to find shape of molecule according to description:

A molecule with a central atom that has two electron groups and two bonded atoms

A molecule with two electron groups on its central atom, two atoms bonded to it has zero lone pair and bond angle of $180°$. So molecule has linear shape. Example ${\mathrm{CO}}_2$. Hence. option 1 is correct.

We need to find shape of molecule according to description:

A molecule with a central atom that has three electron groups and two bonded atoms

A molecule with three electron groups on its central atom, two bonded atoms to central atom will have one lone pair and bond angle of $120°$. Shape of molecule is bent$(120°)$. Example ${\mathrm{SO}}_2$.

Hence. option 4 is correct.