Which of the following compounds has the most signals in the proton-decoupled 13C NMR spectrum?

Which is the most acidic hydrogen?

A compound with molecular formula C8H19N exhibits a triplet at δ 0.9 (6H), a singlet at δ 1.1 (1H), a sextet at δ 1.3 (4H), a quintet at δ 1.4 (4H) and a triplet at δ 2.6 (4H) in its 1H NMR spectrum. Its IR spectrum shows a medium absorption band near 3400 cm-1. Its 13C NMR spectrum showed peaks at δ 13.7, δ 20.5, δ 30.4 and δ 49.2. What is the IUPAC name of this compound?

Which one of the following represents the HOMO of 1,3,5-hexatriene?

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.