JEE Main 2023 — Aldehydes and Ketones Question with Solution
JEE Main 2023 (29 Jan Shift 1)
Question
Match List I with List II.
| List I | List II | ||
| Reaction | Reagents | ||
| (A) | Hoffmann Degradation | (I) | Conc. |
| (B) | Clemmensen reduction | (II) | |
| (C) | Cannizzaro reaction | (III) | |
| (D) | Reimer-Tiemann reaction | (IV) | |
Choose an option
Show full solutionCorrect option: C
Step-by-step explanation
(A) Hoffmann degradation reaction: Hoffmann developed a method for the preparation of primary amines by treating an amide with bromine in an aqueous or ethanolic solution of sodium hydroxide.
(B) Clemmensen reduction reaction: The Clemmensen reduction is a reaction that is used to reduce aldehydes or ketones to alkanes using hydrochloric acid and zinc amalgam.
(C) Cannizzaro reaction: Aldehydes which do not have an -hydrogen atom, undergo self-oxidation and reduction (disproportionation) reaction on heating with concentrated alkali.
(D) Reimer-Tiemann reaction: On treating phenol with chloroform in the presence of sodium hydroxide, a –CHO group is introduced at ortho position of benzene ring. This reaction is known as Reimer-Tiemann reaction.
So, the correct matching is given in the following table:
| Reactions | Reagent used |
| (A) Hoffmann degradation | |
| (B) Clemmensen reduction | |
| (C) Cannizzaro reaction | conc.KOH/ |
| (D) Reimer-Tiemann reaction |
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This is a previous-year question from JEE Main 2023, covering the Aldehydes and Ketones chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.