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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 2 · Set 1 · Q6
(a) Write the major products in the following: OR (b) (i) Oxidation of propanal is easier than propanone. Why? (ii) How can you distinguish between…
(a)
Write the major products in the following :
(i)
$\displaystyle \xrightarrow[273-283\ \text{K}]{\mathrm{HNO_3 + H_2SO_4}}$
(ii)
$\displaystyle +\ \mathrm{NaOH} \xrightarrow[\Delta]{\mathrm{CaO}}$
(iii)
$\displaystyle \xrightarrow{\mathrm{NH_2OH}}$
OR(b) (i) Oxidation of propanal is easier than propanone. Why?
(ii)
How can you distinguish between Acetophenone and Benzophenone?
(iii)
Draw the structure of the following derivative : $\displaystyle 2,4$-Dinitrophenylhydrazone of Propanone
Marking-scheme solution
(a)(i)
/ m-Nitrobenzaldehyde
(ii)
/ Cyclohexane
(iii)
/ Ethanal oxime
OR(b) (i) Because oxidation of propanal involves cleavage of a C–H bond, which is weaker than the C–C bond of propanone.
(ii)
On heating with NaOH and $\displaystyle \mathrm{I_2}$, acetophenone gives a yellow precipitate of iodoform whereas benzophenone does not.
(iii)
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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.