A compound (A) with molecular formula C_4 H_9 I which is a primary alkyl halide, reacts with alcoholic KOH to give compound (B). Compound (B) reacts…

A compound (A) with molecular formula $\displaystyle \mathrm{C}_{4} \mathrm{H}_{9} \mathrm{I}$ 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), $\displaystyle \mathrm{C}_{8} \mathrm{H}_{18}$, which is different from the compound formed when n-butyl iodide reacts with sodium. Write the structures of (A), (B), (C) and (D). Write the chemical equation when compound (A) is reacted with alcoholic KOH.