Hydrocarbons

A Hydrocarbon [A] (molecular formula \(\mathrm{C}_3 \mathrm{H}_6\)) on reaction with \(\mathrm{Br}_2 / \mathrm{CCl}_4\) gave [B]. When [B] is heated with 2 moles of alcoholic \(\mathrm{KOH}\), it gave compound [C]. 3 moles of Compound [C] when passed through red hot Iron tube forms [D]. Identify [D].