[orgo814]

When comparing propene and acrolein (pi CH3 mixing with pi C-C or pi C-O), we know that the mixing is stronger in acrolein because the C-O is lower in energy, thereby lessening the energy gap between pi CH3. Because of this stronger mixing, does this result in a higher magnitude energy drop for the BO and higher magnitude energy raise for the antibonding orbital. I'm comparing the two MO diagrams in my textbook but it's obviously hard to visually compare them and wasn't made obvious.