Which of the following is most stable?

What is the name of the HOMO of excited state conjugated pentaene?  

Which of the following is not a product obtained from the addition of 1 equivalent of HBr to (E)-1,3-pentadiene?  

Predict conditions needed for the following.

What is the kinetic product obtained from the following reaction

Which set of molecular orbitals depict the symmetry of the HOMO and the LUMO in a 2p + 2p cycloaddition?

How many molecular orbitals are produced from the overlap of four p atomic orbitals?

Which of the following statements about a p* antibonding molecular orbital is true?  

Choose the correct ranking of the following dienophiles in decreasing order of reactivity in the Dies-Alder reaction.

Rank the following compounds in order of increasing reactivity diene in a Diels-Alder reaction, least reactive first?