GUJCET 2025 Chemistry Paper

Concept:Vanillin is an aromatic aldehyde with three functional groups attached to a benzene ring.Explanation:Vanillin is $\mathrm{4\text{-}hydroxy\text{-}3\text{-}methoxybenzaldehyde}$.Its structure contains an aldehyde group ($-\mathrm{CHO}$).It also contains a phenolic hydroxyl group ($-\mathrm{OH}$).The third group is a methoxy group ($-\mathrm{OCH_3}$).So the functional groups present are $-\mathrm{CHO}$, $-\mathrm{OH}$, and $-\mathrm{OCH_3}$.Answer:The correct set of functional groups is $-\mathrm{CHO}$, $-\mathrm{OH}$, and $-\mathrm{OCH_3}$.Hence, option B is correct.