Question

Identify the MOs that react to form cyclohexene. HOMO of 1,3-butadiene and LUMO of ethylene LUMO of 1,3-butadiene and LUMO of ethylene HOMO of 1,3-butadiene and HOMO of ethylene LUMO of 1,3-butadiene and LUMO of 1,3-butadiene HOMO of 1,3-butadiene and HOMO of 1,3-butadiene

Answer 1

To form cyclohexene, the HOMO of 1,3-butadiene and the LUMO of ethylene react in a Diels-Alder mechanism, involving a concerted movement of electrons and resulting in a six-membered ring.

Step-by-step explanation:

The molecular orbitals (MOs) that react to form cyclohexene through the Diels-Alder reaction are the Highest Occupied Molecular Orbital (HOMO) of 1,3-butadiene and the Lowest Unoccupied Molecular Orbital (LUMO) of ethylene (ethene). During this reaction, the filled π electron cloud of the butadiene's HOMO overlaps with the empty π* electron cloud of the ethylene's LUMO, facilitating the formation of new sigma bonds that result in the cyclic structure of cyclohexene. This reaction is characteristic of a concerted mechanism, where electrons move in a single, cyclic array, leading to the simultaneous formation of multiple bonds.

Answer 2

HOMO of 1,3-butadiene and LUMO of ethylene

HOMO of ethylene LUMO of 1,3-butadiene

Step-by-step explanation:

1,3 - butadiene underogoes cycloaddition reaction with ethylene to give cyclohexene.

According to Frontier molecular orbital theory HOMO of 1,3 butadiene and LUMO of ethylene and HOMO of ethylene and LUMO of ethylene underoges (4 + 2) in thermal or photochemical condition.