A bottle of allyl bromide was found to contain a large amount of an impurity. A careful...

A bottle of allyl bromide was found to contain a large amount of an impurity. A careful distillation separated the impurity, which has the molecular formula C₃H₆O. The following ¹³C NMR spectrum of the impurity was obtained:

(a)

Propose a structure for this impurity. (b) Assign the peaks in the ¹³C NMR spectrum to the carbon atoms in the structure. (c) Suggest how this impurity arose in the allyl bromide sample