For the formation of the bonding MO the Sp2 hybrid orbitals should overlap in phase. That is both overlapping lobes should have same sign.
The Nitrogen and carbon have Sp2 hybridisation . Where the sigma bond is formed from the hybrid orbitals and bond formed by the lateral overap of unhybridised p orbitals.
The formation of antibonding orbital occurs when the overlapping lobes have opposite phase or opposite sign.
9. (14 points) Consider the CNN bond in the following molecule: NH H3C CH3 For each...