Limitations of octet Rule=> (i) Formation of compounds.

Involving hydrogen because H tends complete its duplet not octet     

(ii) Formation of Be Cl₂, BCl₂ Compounds.

where octet of B and (surrounded by B is not completed 4)    (B by 6) i.e. these are deficient compounds.

(iii) P cl₂, SF₆, IF, H₂SO₄ etc. have more then 8 i.e. these are Hypervalent compounds Central atom surrounded by more than & e.g.

(iv) Compounds of noble gases:-noble gases have already & in outermost shall they make compounds e.g. X eF₂, X ef₄ etc.

(v)  e.g.