Eveline reviewed all the familiar objects at home because she felt nostalgic. She wanted to escape from her annoying family and wanted to lead a happy and peaceful life with her beloved one, Frank. All the wonderful and happy memories from her childhood days with her siblings flashed in front of her eyes like a movie. Which further made her stop from going away from her family.
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.