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Chemistry · 2022 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids3 marksApplyshort answer
CBSE 2022 · Region 3 · Set 1 · Q9
(a) What happens when (i) Propanone is treated with CH_3 MgBr and then hydrolysed? (ii) Ethanal is treated with excess ethanol and acid? (iii)…
What happens when
(i)
Propanone is treated with $\displaystyle \mathrm{CH}_{3} \mathrm{MgBr}$ and then hydrolysed ?
(ii)
Ethanal is treated with excess ethanol and acid ?
(iii)
Methanal undergoes Cannizzaro reaction ?
Write the main product in the following reactions :
(i)
$\displaystyle 2 \mathrm{CH}_{3} \mathrm{COCl}+\left(\mathrm{CH}_{3}\right)_{2} \mathrm{Cd} \rightarrow$
(ii)
$\displaystyle \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHO} \xrightarrow{\mathrm{Zn}(\mathrm{Hg}) / \text { Conc HCl }}$
(iii)
$\displaystyle +\ \mathrm{NaOH} \xrightarrow[\Delta]{\mathrm{CaO}}$
Marking-scheme solution
(a) (i)
/ $\displaystyle 2$-Methylpropan-$\displaystyle 2$-ol
(ii)
/Diethoxy ethane / Acetal of ethanal
(iii) $\displaystyle \mathrm{HCOO}^{-} + \mathrm{CH_3OH}$
/ Methanoate and Methanol
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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.