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Chemistry · 2022 · 3 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids3 marksUnderstandshort answer
CBSE 2022 · Region 3 · Set 1 · Q11
(a) (i) Which acid of the following pair would you expect to be stronger? F - CH_2- COOH or CH_3- COOH (ii) Arrange the following compounds in…
(i)
Which acid of the following pair would you expect to be stronger ? \[\mathrm{F}-\mathrm{CH}_{2}-\mathrm{COOH} \text { or } \mathrm{CH}_{3}-\mathrm{COOH} \]
(ii)
Arrange the following compounds in increasing order of their boiling points : \[\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}, \mathrm{CH}_{3}-\mathrm{CHO}, \mathrm{CH}_{3}-\mathrm{COOH} \]
(iii)
Give simple chemical test to distinguish between Benzaldehyde and Acetophenone.
(i)
Which will undergo faster nucleophilic addition reaction ? Acetaldehyde or Propanone
(ii)
What is the composition of Fehling's reagent ?
(iii)
Draw structure of the semicarbazone of Ethanal.
Marking-scheme solution
(a) (i) \(\displaystyle \mathrm{F}-\mathrm{CH}_{2} \mathrm{COOH}\)
(ii) \(\displaystyle \mathrm{CH}_{3} \mathrm{CHO}<\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}<\mathrm{CH}_{3} \mathrm{COOH}\)
(iii) On warming with Tollens' reagent, benzaldehyde forms silver mirror whereas acetophenone does not.
(b) (i) Acetaldehyde
(ii) Aqueous copper sulphate solution and alkaline solution of sodium potassium tartarate (Rochelle's salt).
(iii) \(\displaystyle \mathrm{CH}_{3} \mathrm{CH}=\mathrm{NNHCONH}_{2}\)
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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.