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Chemistry · 2026 · 5 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids5 marksApplylong answer
CBSE 2026 · Region 2 · Set 1 · Q31
(A) (a) How will you convert the following: 3 + 2 (i) Propanone to Propene (ii) Benzoic acid to Benzaldehyde (iii) Benzene to m-Nitroacetophenone (b)…
(a)
How will you convert the following : $\displaystyle 3$ + $\displaystyle 2$
(i)
Propanone to Propene
(ii)
Benzoic acid to Benzaldehyde
(iii)
Benzene to m-Nitroacetophenone
(b)(i)
Arrange the following compounds in increasing order of their reactivity towards HCN :
(ii)
Identify the compounds, which would undergo Aldol condensation : $\displaystyle \mathrm{HCHO}, \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}, \mathrm{CH}_{3} \mathrm{CHO}$,
(a)
Give chemical tests to distinguish between the following pairs of compounds : $\displaystyle 3$ + $\displaystyle 2$
(i)
Acetophenone and Benzophenone
(ii)
Propanal and Propanone
(iii)
Pentan-$\displaystyle 2$-one and Pentan-$\displaystyle 3$-one
(b)(i)
Which of the following acids is stronger and why ? $\displaystyle \mathrm{CH}_{2} \mathrm{FCOOH}, \mathrm{CH}_{3} \mathrm{COOH}$
(ii)
Arrange the following compounds in the increasing order of their boiling points : $\displaystyle \mathrm{CH}_{3} \mathrm{OCH}_{3}, \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{3}, \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}, \mathrm{CH}_{3} \mathrm{CHO}$
Marking-scheme solution
.
(a) (i)
(ii)
(iii)
(b)(i)
(ii)
.
(a)(i) Acetophenone on heating with NaOH and I2, gives yellow precipitate of
iodoform whereas benzophenone does not give iodoform test.
(ii)
Propanal reduces Tollens’ reagent to silver whereas propanone does not.
(iii)
Pentan-$\displaystyle 2$-one on heating with NaOH and I2, gives yellow precipitate of
iodoform whereas Pentan-$\displaystyle 3$-one does not.
(b)(i)
FCH2COOH is a stronger acid than CH3COOH.
Due to – I effect of F atom
(ii)
CH3CH2CH3 < CH3OCH3 < CH3CHO < CH3CH2OH
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CBSE Class 12 Chemistry past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.