What is the allylic position in a 3-atom conjugated system?

How does molecular orbital theory explain the reactivity of allylic ions?

How are pi electrons distributed in molecular orbitals according to the Aufbau principle in a 3-atom system?

What is the significance of nodes in molecular orbitals regarding the reactivity of allylic ions?

Using molecular orbital theory, analyze the reactivity of lone pairs in a 3-atom conjugated system.