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Chemistry · 2026 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsPreparation of Aldehydes and Ketones3 marksRemembershort answer
CBSE 2026 · Region 2 · Set 1 · Q27
Write the reaction involved in 1+1+1 (a) Rosenmund's reduction (b) Cannizzaro's reaction (c) Hell - Volhard - Zelinsky reaction
Write the reaction involved in $\displaystyle 1+1+1$
(a)
Rosenmund's reduction
(b)
Cannizzaro's reaction
(c)
Hell - Volhard - Zelinsky reaction
Marking-scheme solution
(a)
(b)
H2C=O + H2C=O + Conc. KOH →(Δ) H3COH + HCOOK
(c)
CH3CH2COOH →[(i) Cl2/Red P; (ii) H2O] H3C–CH(Cl)–COOH
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.