When a molecule is more stable than another, that extra energy is __, also called __.
The pi bonds in 1,3-dienes are__.
Why are pi bonds shorter?
The electrons in the double bonds are __ over the entire molecule, creating some pi overlap and pi bonding in the C2-C3 bond. The length of this bond is __ between the normal length of a single bond and that of a double bond.
- resonance energy
- conjugation energy
because they have more s character