What is IUPAC name of following compound?

What is IUPAC name of following compound?

1. 3-Carboxy-4-methyl benzoic acid
2. 5-Carboxy-4-methyl benzoic acid
3. 3-Formyl-6-methyl benzoic acid
4. 5-Formyl-2-methyl benzoic acid

Solution

5-formyl-2-methyl benzoic acid

Asked in: MHT CET 2021 (22 Sep Shift 1)

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