# Among the following, the molecule with s-s overlapping is

1. A
$\text{C}{l}_{2}$
2. B
${\text{H}}_{2}$
3. C
$\text{HC}l$
4. D
${\text{I}}_{2}$

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### Solution:

In the given list ${\text{I}}_{2}$ ,$\text{C}{l}_{2}$  molecules are formed by p-p overlapping of p orbital of each atom and forms one $\sigma$   bond in${\text{I}}_{2}$ ,$\text{C}{l}_{2}$ molecules whereas HCl molecule is formed by end on end overlapping of s orbital of H atom and p orbital of Cl atom. The ${\text{H}}_{2}$ molecule is formed by end on end overlapping of s orbital of H atom and s orbital of another H atom.

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