Which of the following energy diagrams represents the electronic state of the ground state of 1,3-butadiene?

What diene and dienophile are used in a Diels-Alder reaction to prepare the following compound?

Identify the allylic halide(s).

Which of the following compounds absorbs the longest wavelength of UV-visible light?

Which of the following compounds, with molecular formula C9H12O, is consistent with the 1H NMR and 13C NMR spectra shown below?

Based on the following table. Compound λmax  (nm) W 190 X 340 Y 560 Z 250 Compound ______ has the largest energy difference between the HOMO and LUMO.

How many peaks would be observed for each of the circled protons in the compounds below?

Which one of the following compounds would exhibit seven signals in its 13C NMR spectrum?

Which of the following conjugated dienes represent two conformations?

Which of the following indicated C—C bonds is(are) the shortest?