The story definitely reminds one of “Birth’ by A. J. Cronin. There is a striking similarity between both the stories. Both revolve around doctors who try their level best to save the lives of nearly dead human beings. In the story ‘Birth’, Dr Andrew saves the life of an almost still born baby boy with a lot of effort, while ‘The Enemy’ deals with the story of Dr Sadao who saves an American soldier from the enemy troops during the times of war. Both the stories deal with humanity, love, affection, selflessness and a strong sense of duty.
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.