MHT CET Chemistry Question (2026) — Solution

Step-by-step solution

Toluic acid is methylbenzoic acid, which contains one -COOH group. Acrylic acid is propenoic acid (CH_2=CH-COOH), which contains one -COOH group. Phthalic acid is benzene-1,2-dicarboxylic acid (C_6H_4(COOH)_2), which contains two -COOH groups. Thus, it is a dicarboxylic acid. Isobutyric acid is 2-methylpropanoic acid ((CH_3)_2CH-COOH), which contains one -COOH group. Therefore, phthalic acid is not a monocarboxylic acid. Answer: Phthalic acid