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Example:
Question. What happens when there exist C=C in the side chain.
Answer. It is relatively easier to oxidise a C=C than the benzene side chain. Hence, you have to first perform an oxidative cleavage of the C=C and write down the oxidized product of the fragment not attached to the benzene ring.
Then perform a side chain oxidation to oxidise the remaining fragment to give benzoic acid and CO2.
Example:
