Dr Margolin did not accept nor appreciate the kind of life the American Jewish community led. Jewish laws and customs were utterly distorted, according to him. He did not like their celebrations, and he felt annoyed and irritated. Those who had no regard for Jewishness wore skullcaps. He disliked Anglicised Yiddish, the Yiddishised English, the ear-splitting music and the unruly way of dance. He felt ashamed and did not like taking his wife to a wedding or any such gatherings.
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.