Question

Why donat we take quartynary carbon in trends like hyperconjugation , stability of carbocation etc.

Answer 1

Quaternary carbon means that carbon is bonded to five carbon atoms. Quaternary carbon does not exist. Carbon is tetravalent in nature. It can not have valency five. If it will have five valency then only quaternary carbon is possible or it can be possible when it has lone pair of electrons so that it can donate its electrons to bond with another atom. But carbon does not have lone pair of electrons.