The woman Dr Margolin encountered at the wedding was his one true love, Raizel, the daughter of Melekh, the watchman. He loved her so much that he wanted to marry her, but he had no luck and couldn’t marry her. The last time Dr Margolin heard of her was that she had married someone else and had children, who the Nazis later killed.
A compound (A) with molecular formula $C_4H_9I$ which is a primary alkyl halide, reacts with alcoholic KOH to give compound (B). Compound (B) reacts with HI to give (C) which is an isomer of (A). When (A) reacts with Na metal in the presence of dry ether, it gives a compound (D), C8H18, which is different from the compound formed when n-butyl iodide reacts with sodium. Write the structures of A, (B), (C) and (D) when (A) reacts with alcoholic KOH.