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Aldehydes and Ketones - ISC Class 12 Chemistry Questions with Answers

56 past-paper questions on Aldehydes and Ketones from ISC Class 12 Chemistry papers (2027-2018), newest first. Open one to see its answer.

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Answer the following: Identify the compounds [A], [B] and [C] in the following reaction sequence… 2027 · 5 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [methyl alcohol, ethyl alcohol, paired… 2027 · 1 mark · Fill in
An alkene [A] with molecular formula, $\text{C}_5\text{H}_{10}$ on ozonolysis and subsequent hydrolysis gives a mixture of two… 2027 · 2 marks · Short answer
An organic compound with molecular formula $\text{C}_3\text{H}_6\text{O}$ does not give silver mirror test with Tollen’s reagent… 2026 · 1 mark · MCQ
Identify the end product [C] in the following sequence of chemical reaction… 2026 · 1 mark · MCQ
Rohit is studying the iodoform reaction by using the following compounds: (P) $\text{CH}_3\text{OH}$ (Q) $\text{CH}_3\text{CHO}$… 2026 · 1 mark · MCQ
What happens when (Give chemical equations): (a) Propanone is treated with $\text{CH}_3\text{MgBr}$ and then hydrolysed. (b)… 2026 · 5 marks · Long answer
Acetyl chloride is hydrogenated over palladium in presence of barium sulphate in boiling xylene. Write the balanced chemical… 2026 · 2 marks · Short answer
Answer the following: What happens when (write chemical equations): (a) Calcium acetate is subjected to dry distillation. (b)… 2026 · 5 marks · Short answer
What happens when carbonyl compound is treated with zinc amalgam and concentrated hydrochloric acid? Give chemical equation and… 2026 · 2 marks · Short answer
Write chemical equations to convert each of the following: Acetic acid to acetaldehyde Formaldehyde to urotropine 2026 · 2 marks · Short answer
Identify the end product [B] in the following sequence of chemical reaction… 2026 · 1 mark · MCQ
What happens when (write chemical equations): (a) Benzaldehyde is heated with alcoholic $\text{KCN}$. (b) Formaldehyde is heated… 2026 · 5 marks · Short answer
Write chemical equations to convert each of the following: Toluene to benzaldehyde Acetic acid to acetamide 2026 · 2 marks · Short answer
Write chemical tests to distinguish between the following pairs of compounds: Acetaldehyde and acetone Acetic acid and… 2026 · 2 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [four, three, remains same, propane… 2025 · 1 mark · Fill in
Choose the appropriate word(s) from the bracket [+2, ethane, tetrahedral, square planar, zero, dry cell, nickel-cadmium cell… 2025 · 1 mark · Fill in
An organic compound [A] having molecular formula $\text{C}_3\text{H}_6\text{O}$ gives a positive iodoform test. On reduction by… 2025 · 2 marks · Short answer
Choose the appropriate word(s) from the bracket [ethanol, [Fe(H2O)6]2+, anode, d2sp3, Cannizzaro, reducing, cathode, sp3d2… 2025 · 1 mark · Fill in
How will you prepare the following compounds? Give chemical reaction for: Butan-2-one from propanoic acid. m-chlorotoluene from… 2025 · 2 marks · Short answer
The aldol condensation takes its name from aldol (3-hydroxybutanal) a name introduced by Wurtz who first prepared the… 2025 · 5 marks · Case based
From the organic compounds given below: I. Acetophenone II. Benzaldehyde III. Benzophenone Arrange the compounds in the… 2025 · 2 marks · Short answer
Identify the compounds [A] and [B] in the following reactions… 2025 · 2 marks · Short answer
Which of the following compound is the most and least reactive towards nucleophilic substitution reaction respectively? (I)… 2025 · 1 mark · MCQ
Write chemical equations to illustrate the following name reactions: Clemmensen’s reduction Cross Aldol condensation Kolbe’s… 2025 · 3 marks · Short answer
Three organic compounds A, B and C are non cyclic functional isomers of carbonyl compounds with molecular formula… 2025 · 2 marks · Short answer
This box gives a list of aldehydes and ketones. Choose the appropriate aldehyde/ ketone that reacts with $\text{CH}_3\text{MgBr}$… 2025 · 3 marks · Short answer
Identify the compounds [A] and [B] in the following reactions… 2025 · 2 marks · Short answer
‘In 1915, a senior lecturer in Biochemistry at the University of Manchester named Dr. Chaim Weizmann invented a fermented process… 2025 · 5 marks · Case based
An organic compound [A] which has characteristic odour, reacts with conc. $\text{NaOH}$ to give two compounds [B] and [C]… 2025 · 2 marks · Short answer
Write chemical equations to illustrate the following name reactions. Rosenmund’s reaction Benzoin condensation Perkin’s reaction 2025 · 3 marks · Short answer
An organic compound [A], having a specific smell forms two compounds [B] and [C] by reacting with conc. sodium hydroxide. The… 2024 · 5 marks · Short answer
Give a reason for each of the following: (a) Formaldehyde does not undergo aldol condensation, but acetaldehyde does. (b)… 2024 · 5 marks · Short answer
An organic compound [A] having molecular formula $\text{C}_4\text{H}_{10}\text{O}$ forms a compound [B] with molecular formula… 2024 · 2 marks · Short answer
An organic compound $\text{C}_2\text{H}_4\text{O}$ gives red precipitate when heated with Fehling solution. It also undergoes… 2024 · 3 marks · Short answer
Benzaldehyde is less reactive than propionaldehyde. Why? In the preparation of ethanal by the oxidation of ethanol, ethanal… 2024 · 2 marks · Short answer
Identify the compounds [A], [B] and [C]… 2024 · 3 marks · Short answer
Write the chemical equation for the following named organic reactions. Haloform reaction Reimer - Tiemann reaction Kolbe -… 2023 · 3 marks · Short answer
Write the chemical equations to illustrate the following name reactions: (a) Cannizzaro’s reaction (b) HVZ reaction (c) Aldol… 2023 · 5 marks · Short answer
Give one chemical test for each to distinguish between the following pair of compounds. Formaldehyde and acetic acid Acetaldehyde… 2023 · 2 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: [two, Williamson’s synthesis, three… 2023 · 4 marks · Fill in
An aromatic carboxylic acid [A] which readily sublimes on heating, produces compound [B] on treatment with $\text{PCl}_5$… 2023 · 2 marks · Short answer
Starting with methyl magnesium bromide, how will the following compounds be synthesised? (a) Acetaldehyde (b) Acetone (c) Acetic… 2023 · 5 marks · Short answer
Fill in the blanks by choosing the appropriate word(s) from those given in the brackets: (two, four, $\text{sec}^{-1}$… 2022 · 3 marks · Fill in
One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of $44\text{ amu}$. The… 2022 · 1 mark · MCQ
Give one chemical test for each to distinguish between the following pairs of compound: Acetaldehyde and benzaldehyde Acetone and… 2022 · 2 marks · Short answer
How will you bring about the following conversions? (Give equation). Acetic acid to acetone Formaldehyde to urotropine 2022 · 2 marks · Short answer
Write chemical equations to illustrate each of the following name reactions: Rosenmund’s reduction Clemmensen’s reduction 2022 · 2 marks · Short answer
A ketone A ($\text{C}_4\text{H}_8\text{O}$) which undergoes Iodoform reaction gives compound B on reduction. B on heating with… 2020 · 3 marks · Short answer
How will you convert the following: (Give balanced equation) Benzoyl chloride to benzaldehyde. Methyl chloride to acetic acid… 2020 · 3 marks · Short answer
Write chemical equations to illustrate the following name reactions: (1) Aldol condensation. (2) Cannizzaro’s reaction. (3)… 2019 · 5 marks · Short answer
Give balanced chemical equations for the following reactions: (1) Acetaldehyde reacts with hydrogen cyanide. (2) Acetone reacts… 2019 · 5 marks · Short answer
Write the product(s) of the following reactions: (1) $\text{CH}_3\text{COCH}_3 + \text{H}_2\text{NOH} \rightarrow$ (2)… 2018 · 5 marks · Short answer
Write chemical equations to illustrate the following name reactions: (1) Clemmensen’s reduction (2) Rosenmund’s reduction (3) HVZ… 2018 · 5 marks · Short answer
Write the chemical equations to illustrate the following name reactions: (1) Wolff-Kishner reduction. (2) Aldol condensation. (3)… 2018 · 5 marks · Short answer
Give balanced equations for the following reactions: (1) Benzaldehyde reacts with hydrazine. (2) Acetic acid reacts with… 2018 · 5 marks · Short answer

Aldehydes and Ketones - ISC Class 12 Chemistry Questions with Answers

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