Major product B of the following reaction has -bond. [figure]
Answer
5
Solution
[figure]
Hot alkaline KMnO4 oxidises the whole side chain to -COO K (A).
[figure]
In HNO3/H2SO4 the group is –COOH, a meta-director, so B is m-nitrobenzoic acid.
π-bonds in B: ring C=C = 3, C=O = 1, N=O of -NO2 = 1
∴ Total = 3 + 1 + 1 = 5
Answer: 5