A compound with the formula C₅H₈O has the following DEPT ¹³C NMR spectrum. Draw the structure of the compound.

The given spectrum shows the estimated ¹³C NMR peaks of phenyl butyrate. Show which of these carbons will appear in DEPT-90 and DEPT-135 spectra.

Draw the expected DEPT sequence spectra for the following molecule.

Determine the number of signals detected in the ¹³C NMR spectrum of the following molecule.

The following proton-coupled ¹³C NMR spectrum reveals a structure with the molecular formula C₉H₁₈O. Determine the identity of the compound.

In distinguishing 1-hexene, cis-3-hexene, and 3-methylene pentane, which is better, ¹H or ¹³C NMR spectroscopy? Explain your answer.

A sample of allyl chloride contained a significant amount of an impurity. The impurity was isolated using distillation technique and a ¹³C-NMR spectrum of the impurity was obtained.

If the molecular formula of the impurity is C₃H₆O:
(i) Give a plausible structure for the impurity.
(ii) Assign all peaks in the ¹³C-NMR spectrum of the impurity.
(iii) Explain how the impurity arose in the sample of allyl chloride.