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Paramjeet verma
This compound is 1,2,3-triazine which is an aromatic system. The lone pairs of Nitrogen atom is present in sp2 hybridised orbital and does not involved in conjugation.
why sir
Only electrons present in p orbitals of atoms can be involved in conjugation.N atom is sp2 hybridised here which has planar geometry of the lobes of orbitals. For conjugation Pz orbital is used (perpendicular to the plane of the molecule)