MHTCET 19 Apr 2026 Shift 1 Paper

Concept:An aldehyde contains one or more formyl groups, $-\mathrm{CHO}$, attached to a carbon chain or ring.This question tests the ability to count the number of $-\mathrm{CHO}$ groups in each given compound.Explanation:Phthaldehyde is a dialdehyde derived from benzene.Its molecular formula is $\mathrm{C_6H_4(CHO)_2}$.It contains two $-\mathrm{CHO}$ groups attached directly to the benzene ring.Hence, it satisfies the condition of having two aldehyde groups.Acrolein is $\mathrm{CH_2=CHCHO}$ and contains only one $-\mathrm{CHO}$ group.O-Tolualdehyde is $\mathrm{CH_3C_6H_4CHO}$ and contains only one $-\mathrm{CHO}$ group.Butyraldehyde is $\mathrm{CH_3CH_2CH_2CHO}$ and contains only one $-\mathrm{CHO}$ group.Therefore, among the given options, only phthaldehyde has two $-\mathrm{CHO}$ groups in its molecule.Answer:Option C: Phthaldehyde