MHTCET 10 May 2024 Shift 2 Paper

Concept:The carboxylic acid group has higher priority than the phenol group, so benzoic acid is the parent chain.Explanation:The given compound contains three substituents on a benzene ring: $-\mathrm{COOH}$, $-\mathrm{OH}$, and $-\mathrm{C_2H_5}$.$-\mathrm{COOH}$ is the principal functional group, so the parent name is benzoic acid.Number the ring to give the $-\mathrm{COOH}$ group locant 1.The $-\mathrm{OH}$ and $-\mathrm{C_2H_5}$ groups are present at positions 3 and 5.Alphabetically, ethyl comes before hydroxy, so ethyl gets the lower locant, 3, and hydroxy gets locant 5.Thus, the correct IUPAC name is 3-ethyl-5-hydroxybenzoic acid.Answer:Option C: 3-Ethyl-5-hydroxybenzoic acid.