Use valence bond theory to explain the bonding in cl2 and
hcl. show how the atomic orbiatls overlap when a bond is
formed.

Answer

The answer is explained in the attachment.

There are 7 valence electrons in a Chlorine atom. A  chlorine atom needs one more electron to have a complete octet.

Explanation:

The answer is explained in the attachment.

There are 7 valence electrons in a Chlorine atom. A  chlorine atom needs one more electron to have a complete octet.

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be