Failure of octet rule : There are number of stable molecules known in which the octet rule is violated that is atoms in these molecules have number of electrons in the valency shell either short of octet or more than octet.
BeF2, BF3, AlH3 are electron- deficients (Octet incomplete) hence are Lewis acid.
In PCl5, P has 10 electrons in valency shell while in SF6, S has 12 electrons in the valence shell. The Sugden introduced singlet linkage in which one electron is donated (Instead of one pair of electrons) to the electron deficient atom so that the octet rule is not violated. This singlet can be represented as (?). Thus, PCl5 and SF6 have structures as,
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