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Chemistry · 2025 · 5 marks
Aldehydes, Ketones and Carboxylic AcidsNomenclature and Structure of Carbonyl Group5 marksApplylong answer
CBSE 2025 · Region 2 · Set 2 · Q32
(A) (a) Give IUPAC name of CH_3- CH = CH - CHO. (b) Give a simple chemical test to distinguish between propanal and propanone. 1 (c) How will you…
(a)
Give IUPAC name of $\displaystyle \mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\mathrm{CHO}$.
(b)
Give a simple chemical test to distinguish between propanal and propanone. $\displaystyle 1$
(c)
How will you convert the following :
(i)
Toluene to benzoic acid
(ii)
Ethanol to propan-$\displaystyle 2$-ol
(iii)
Propanal to $\displaystyle 2$-hydroxy propanoic acid
Complete each synthesis by giving missing starting material, reagent or products :
(a)
(b)
(c)
(d)
(e)
Marking-scheme solution
(a)
But-$\displaystyle 2$-enal
(b)
On heating with NaOH + I2, propanone gives yellow ppt. Of iodoform (CHI3 ) whereas
propanal does not.
(c)(i)
(ii)
(iii)
(B)
(b)
(c)
(d)
(e)
CH3COCl / Anhy. AlCl3 or (CH3CO)2O/ Anhy. AlCl3
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.