What do you mean by conjugation?
It is the overlap of p-orbitals across a sigma bond. As we know the hybridization is sp2
there is an unhybridized p orbital per carbon atom. When a compound or molecule has
alternating single bonds and pi bonds, the unhybridized p orbitals can get overlap with
each other, forming an electron cloud. The electron in those p orbitals then gets
delocalized inside this electron cloud. This phenomenon of this overlapping of p orbitals
is known as conjugation.
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