The IUPAC name of the following compound is: 4 - formyl - 2 - sulphobenzoic acid

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Solution

Carboxylic acid is given preference over sulphate acid as well as $- C H O$ group .So numbering will start from carbon attach to $- C O O H$ group.
As according to alphabetical order formyl is written first than sulphonic group so it is $4 -$ formyl $- 2 -$ sulphobenzoic acid.

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