The effect of hyperconjugation on the stability of alkenes with MO theory?

Question

Hyperconjugation stabilizes carbocations and that makes sense because electrons are given to the empty p orbital. But how does it stabilize alkenes? Can molecular orbital theory be used to explain it?

Answer 1

In my opinion, the simplest explanation can be obtained directly from Heisenberg's principle. Conjugation leads to an extended orbital, and that means the electrons that occupy it get more space (literally) that means greater deltaX, which means deltaP (and, hence, total energy) is lower. That is somewhat oversimplified explanation, but it not incorrect