Six x molecular orbitals of 1,3,5-hexatriene 888888 Antibonding (5 nodes) 888888 Antibonding (4 nodes) 888888 Antibonding (3 nodes) Six 2p atomic orbitals Bonding (2 nodes) 888 Bonding 888888 Bonding (0 nodes 计 Ground state Excited state Six π molecular orbitals of 1,3,5-hexatriene