His life was a whirlwind as he told Bessel, "I've done virtually anything you can conceive of save a tailor or a soldier." I've sheared sheep, humped my swag, and harpooned a whale as a boundary rider. I've rigged ships, prospected for gold, skinned dead bullocks, and passed up more money than the old guy would have scraped together in his lifetime.
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.