Major product B of the following reaction has ______ π-bond.
Answer: 5
Solution
KMnO4/KOH,Δ oxidises the ethyl side chain to –COOK, giving benzoic acid (A); HNO3/H2SO4 nitrates the ring (B). Counting π-bonds in B: 3 in the aromatic ring + 1 in C=O of –COOH + 1 in the N=O of –NO2 = 5.