In today's world, the Industrial Revolution, the age of machinery, new technologies have developed rapidly with the production of goods that have opened doors for humankind. There have been new-age technologies that have helped speed up agricultural domains and result in overgrowing productions. 'Nature may have tricks up her sleeve to check us if the chemists exploit her too greedily' is related to today's context as overexploitation of resources is very harmful to today's Nature. When all these technologies override Nature without any control, we humans have to face many problems in the future. The use of chemical fertilisers in factories, agricultural fields create a varied impact on Nature. Thus, the author, G.B Shaw, means that there should be a check on natural resources.
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.