Question

Mention any two drawbacks of octet theory​

Answer 1

Octet rule fails to explain the following:

(1) The stability of incomplete octet molecules, i.e., the molecules with the central atom containing less than eight electrons.

(2) The stability of expanded octet molecules, i.e., the molecules with the central atom containing more than eight electrons.

Answer 2

Explanation:

(a) It fails to explain the incomplete octet of the central atom. Examples: The central atom Li, Be and B in LiCl, BeCl2 and BCl3 have 1,2 and 3 valence electrons only respectively.

(b) The octet rule is not satisfied for the atoms in a molecule having an odd no of electrons. Examples: NO and NO2

(c) The octet rule cannot be applied in case of elements in and beyond the third period of the periodic table since these elements have more than 8 electrons. Examples: PF5, SF6,H2SO4 etc.,

(d) This rule fails to explain the shape and relative stability of molecules.

Mark as brainlist