CBSE 2025 · Region 2 · Set 2 · Q32 · 5 marks
(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 acidComplete each synthesis by giving missing starting material, reagent or products :(a)
(b)
(c)
(d)
(e)
(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.
(i)
(ii)
(iii)(B)
(a)
(b)
(c)
(d)
(e)
CH3COCl / Anhy. AlCl3 or (CH3CO)2O/ Anhy. AlCl3
Aldehydes, Ketones and Carboxylic AcidsNomenclature and Structure of Carbonyl GroupApplylong_answermedium
Practice Aldehydes, Ketones and Carboxylic Acids →All Aldehydes, Ketones and Carboxylic Acids questions
More from Aldehydes, Ketones and Carboxylic Acids
- The acid formed when propyl magnesium bromide is treated with CO 2 followed by acid hydrolysis is:2025 · asked 3×
- (i) Identify A, B and C in the following reactions: (ii) Give reasons for the following: (I) Carboxylic acids…2025 · asked 3×
- Give chemical tests to distinguish between the following pairs of compounds: (i) Phenol and Benzoic acid (ii)…2024 · asked 3×
- (i) Write the major product(s) in the following reactions: (2) (3) (ii) Give simple chemical tests to…2024 · asked 3×
- Explain the following reactions and write chemical equation involved: Wolff-Kishner reduction Etard reaction…2025 · asked 3×
- Assertion: Benzoic acid does not undergo Friedel - Crafts reaction. Reason (R): Carboxyl group is…2024 · asked 3×
- (i) Write the product(s) when: (I) One mol of ethanal is treated with 1 mol of CH 3 OH in the presence of dry…2026 · asked 3×
- The carbon - oxygen double bond is polarised in aldehydes and ketones due to higher electronegativity of…2023 · asked 3×
CBSE Class 12 Chemistry past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.