Question

Which of the following molecule deviates from octet rule with respect to central atom
PCI​

Answer 1

Some of the molecules deviate from octet rule when the central atom contains more/less than 8 electrons in its outer (valence) shell.

Examples of expanded octet compounds:

• $SF_{6}$

• $IF_{7}$

• $PCl_{5}$

Examples of electron deficient compounds:

• $BCl_{3}$

Usually the group 14 , 15 , 16 , 17 elements like Sulphur , Phosphorus , Halogens can form expanded octet compounds.

On the other hand , the elements of group 13 like Barium can form octet deficient compounds.

Hope It Helps.