Question 1
Classify the following compounds as having cumulated, conjugated or isolated double bonds.

◦ I = isolated; II = conjugated
◦ I = cumulated; II = conjugated
◦ I = conjugated; II = cumulated
◦ I = conjugated; II = isolated
◦ I = cumulated; II = isolated
Question 2
Which of the following best describes the stereochemistry of ring closure and the product for the following reaction?

◦ conrotatory;
cis-3,4-diethylcyclobutene
◦ disrotatory;
cis-3,4-diethylcyclobutene
◦ conrotatory;
trans-3,4-diethylcyclobutene
◦ disrotatory;
trans-3,4-diethylcyclobutene
◦ disrotatory; 3,3-diethylcyclobutene