MHTCET 15 Apr 2026 Shift 2 Paper

Concept:For carboxylic acids, the functional group carbon is always numbered as carbon 1.Explanation:The given compound is $\mathrm{CH}_{3}\mathrm{CH}=\mathrm{CHCH}=\mathrm{CHCOOH}$.The principal functional group is $-\mathrm{COOH}$, so numbering starts from its carbon atom.Writing the chain in the reverse direction gives:$\mathrm{HOOC}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}_{3}$This chain contains 6 carbon atoms, so the parent is hexanoic acid.There are two double bonds at positions 2 and 4.Hence, the IUPAC name is $\text{Hexa-2,4-dienoic acid}$.Answer:Option B: Hexa-2,4-dienoic acid.