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Chemistry · 2022 · 2 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids2 marksUnderstandvery short answer
CBSE 2022 · Region 5 · Set 2 · Q2
Explain the following reactions: (a) Clemmensen reduction (b) Stephen reaction
Explain the following reactions :
(a)
Clemmensen reduction
(b)
Stephen reaction
Marking-scheme solution
(a)
$\displaystyle \xrightarrow[\text{HCl}]{\text{Zn-Hg}}$ $\displaystyle +\ \mathrm{H_2O}$
(b)
RCN + SnCl$\displaystyle _2$ + HCl $\displaystyle \longrightarrow$ RCH=NH $\displaystyle \xrightarrow{\text{H}_3\text{O}^+}$ RCHO
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.