CBSE 2026 · Region 2 · Set 1 · Q27 · 3 marks
Write the reaction involved in $\displaystyle 1+1+1$(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)
H<sub>$\displaystyle 2$</sub>C=O + H<sub>$\displaystyle 2$</sub>C=O + Conc. KOH →(Δ) H<sub>$\displaystyle 3$</sub>COH + HCOOK
(c)
CH<sub>$\displaystyle 3$</sub>CH<sub>$\displaystyle 2$</sub>COOH →[(i) Cl<sub>$\displaystyle 2$</sub>/Red P; (ii) H<sub>$\displaystyle 2$</sub>O] H<sub>$\displaystyle 3$</sub>C–CH(Cl)–COOH
Aldehydes, Ketones and Carboxylic AcidsPreparation of Aldehydes and KetonesRemembershort_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.