See image — IUPAC and Nomenclature Chemistry Question

💡 Solution & Explanation

Correct option: \(\text{C}\). The correct choice is \(\text{C}\), CH - CH = CHCOOH. Applying the standard IUPAC sequence-parent selection, lowest locants, principal functional group priority, and alphabetical substituent ordering-selects the marked option. Recovered question text: 27. Which of the following is crotonic acid : (A) CH = CH - COOH (B) C H - CH = CH-COOH 2 6 5 CH COOH (C) CH - CH = CHCOOH (D) 3 CH COOH