59) Which of the following aromatic compounds fails to undergo Friedal−Crafts reaction?

60) Which one of the following undergoes nitration most readily?

61) Which of the following compounds will form a hydrocarbon on reaction with a Grignard reagent?

62) Methane is formed when

63) If n is the number of carbon atoms in the potassium salt of a carboxylic acid, then the alkane formed on electrolysis of aqueous solution of this salt would have carbon atoms equal to: