Aldehyde and Ketone PYQs - Last 10 Years
COMEDK / Chemistry / Organic Chemistry / 40 recent questions
ChemistryOrganic Chemistry2017-2026
Practice 40 COMEDK Chemistry questions from Aldehyde and Ketone. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Chemistry / Organic Chemistry
2020-2026
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36
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2022-2026
40
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2017-2026
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Last 10 Years Aldehyde and Ketone Questions
Showing 40 of 40 filtered questions.
1Aldehyde And Ketone
Propanal on reaction with dilute NaOH , undergoes aldol condensation resulting in the formation of a compound A . identify the correct structure of A and name of the compound.
MCQ+1 / -02026
2Aldehyde And Ketone
\(\text { Identify the compounds } \mathrm{A} \text { and } \mathrm{B} \text { from the following reaction sequence: }\)
MCQ+1 / -02026
3Aldehyde And Ketone
Etard reaction is a method of preparation of benzaldehyde by oxidation of toluene. The oxidizing agent used in this reaction is:
MCQ+1 / -02026
4Aldehyde And Ketone
Which of the following is NOT TRUE about nucleophilic addition reactions of aldehydes?
MCQ+1 / -02026
5Aldehyde And Ketone
\(\text { The product formed in the following reaction is: }\)
MCQ+1 / -02026
6Aldehyde And Ketone
$$ \begin{aligned} &\text { Identify products }\left[\mathbf{P}_{\mathbf{1}}\right] \text { and }\left[\mathbf{P}_{\mathbf{2}}\right] \text { formed when Benzonitrile undergoes the following reactions. }\\ &\text { Benzo nitrile } \xrightar...
MCQ+1 / -02026
7Aldehyde And Ketone
\(\text { Consider the series of reactions given and identify the final product [Z]. }\)
\([X] \xrightarrow{\mathrm{CrO}_3}[Y] \quad \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{CH}_3 \mathrm{MgBr}}[Z]\)
\([X] \xrightarrow{\mathrm{CrO}_3}[Y] \quad \xrightarrow[\text { (ii) } \mathrm{H}_2 \mathrm{O}]{\text { (i) } \mathrm{CH}_3 \mathrm{MgBr}}[Z]\)
MCQ+1 / -02026
8Aldehyde And Ketone
Which one of the following is the correct statement?
MCQ+1 / -02026
9Aldehyde And Ketone
Choose the correct reason:
o-hydroxybenzaldehyde is a liquid at room temperature while $p$-hydroxy-benzaldehyde is a high melting solid, because
o-hydroxybenzaldehyde is a liquid at room temperature while $p$-hydroxy-benzaldehyde is a high melting solid, because
MCQ+1 / -02026
10Aldehyde And Ketone
\(\text { Match the reactions in List I with the final products formed as given in List II. }\)
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.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;...
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.tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;...
MCQ+1 / -02026
11Aldehyde And Ketone
Identify $[\mathrm{X}]$, the final product formed when 2 moles of Ethanal undergoes the following series of reactions with reagents [(i) to (iv)]
MCQ+1 / -02025
12Aldehyde And Ketone
Two statements, one Assertion (A) and the other Reason (R) are given. Choose the correct option.
Assertion: Compound $[\mathrm{X}]$ reacts with Hydrazine in presence of $\mathrm{KOH} /$ Glycol to form the product $[\mathrm{Y}]$.
Reason: Re...
Assertion: Compound $[\mathrm{X}]$ reacts with Hydrazine in presence of $\mathrm{KOH} /$ Glycol to form the product $[\mathrm{Y}]$.
Reason: Re...
MCQ+1 / -02025
13Aldehyde And Ketone
Which one of the following reactions does not give the correct combination of reactants and the major products formed in the reaction?
MCQ+1 / -02025
14Aldehyde And Ketone
Identify X, Y and Z formed in the reaction:
MCQ+1 / -02025
15Aldehyde And Ketone
Which one of the following is the product $(\mathrm{Z})$ formed at the end of the given reaction:
$$\begin{aligned}
& \text { Propan-1-ol }+\mathrm{SOCl}_2 \rightarrow[\mathrm{X}] \\
& {[\mathrm{X}]+\mathrm{HC} \equiv \mathrm{C}-\mathrm{Na}...
$$\begin{aligned}
& \text { Propan-1-ol }+\mathrm{SOCl}_2 \rightarrow[\mathrm{X}] \\
& {[\mathrm{X}]+\mathrm{HC} \equiv \mathrm{C}-\mathrm{Na}...
MCQ+1 / -02025
16Aldehyde And Ketone
An organic compound " A " reacts with $\mathrm{Zn} / \mathrm{Hg}$ / Conc. HCl to form p-Xylene. It reduces Tollen's reagent and on oxidation with $\mathrm{KMnO}_4 / \mathrm{H}^{+}$it yields 1, 4-benzenedicarboxylic acid.
Identify compound A...
Identify compound A...
MCQ+1 / -02025
17Aldehyde And Ketone
Choose the incorrect statement.
MCQ+1 / -02025
18Aldehyde And Ketone
\(\text { Identify }[\mathrm{B}] \text { and }[\mathrm{C}] \text { formed in the reactions given below. }\)
MCQ+1 / -02024
19Aldehyde And Ketone
Identify the Reagents I and II to be used in the course of the given reactions.
MCQ+1 / -02024
20Aldehyde And Ketone
Which one of the following statements is incorrect regarding acetal and ketal formation when Propanal and Propanone are separately reacted with Ethanol in presence of anhydrous \(\mathrm{HCl}\) gas.
MCQ+1 / -02024
21Aldehyde And Ketone
A Carbonyl compound \(\mathrm{X}\) when reacted with Methyl magnesium bromide followed by hydrolysis gave product \(\mathrm{Y}\). When \(\mathrm{Y}\) is heated with \(\mathrm{Cu}\) at \(573 \mathrm{~K}\), it gave \(\mathrm{Z}\) (2- Methylbu...
MCQ+1 / -02024
22Aldehyde And Ketone
Which one of the following is the correct order of reagents to be used to convent [A] to [X] ?
\(\text { Reagents: } \mathrm{PCC}, \mathrm{PCl}_5, \mathrm{LiAlH}_4, \frac{\mathrm{KCN}}{\mathrm{H}_3 \mathrm{O}^{+}}\)
\(\text { Reagents: } \mathrm{PCC}, \mathrm{PCl}_5, \mathrm{LiAlH}_4, \frac{\mathrm{KCN}}{\mathrm{H}_3 \mathrm{O}^{+}}\)
MCQ+1 / -02024
23Aldehyde And Ketone
Identify the end-product [D] formed when solution salicylate undergoes the following series of reactions
MCQ+1 / -02024
24Aldehyde And Ketone
Given are the names of 4 compounds. Two of these compounds will not undergo Cannizzaro's reaction. Identify the two.
A. 2-Chlorobutanal
B. 2,2-Dimethylpropanal
C. Benzaldehyde
D. 2-Phenyl ethanol
A. 2-Chlorobutanal
B. 2,2-Dimethylpropanal
C. Benzaldehyde
D. 2-Phenyl ethanol
MCQ+1 / -02024
25Aldehyde And Ketone
What is/are the product/s formed when Benzaldehyde and Ethanal react in presence of dil. \(\mathrm{NaOH}\) followed by heating the intermediate product formed?
MCQ+1 / -02024
26Aldehyde And Ketone
Predict the final major product 'S' of the following reaction
MCQ+1 / -02024
27Aldehyde And Ketone
Which of the following compounds undergo Aldol condensation followed by dehydration to give 3-phenylprop-2-en-1-al?
MCQ+1 / -02024
28Aldehyde And Ketone
Identify the final product formed during the course of the given reactions.
Pentan-2-one \(\xrightarrow{\mathrm{NaCN} / \mathrm{HCl}}[\mathrm{X}]\)
\([\mathrm{X}] \xrightarrow[95 \% \mathrm{H}_3 \mathrm{PO}_4]{\Delta \text { with }}[Y]\)
Pentan-2-one \(\xrightarrow{\mathrm{NaCN} / \mathrm{HCl}}[\mathrm{X}]\)
\([\mathrm{X}] \xrightarrow[95 \% \mathrm{H}_3 \mathrm{PO}_4]{\Delta \text { with }}[Y]\)
MCQ+1 / -02023
29Aldehyde And Ketone
What would be the products obtained when a mixture of p-Methoxy benzaldehyde and Methanal are heated with \(50 \%\) concentrated Caustic soda solution?
MCQ+1 / -02023
30Aldehyde And Ketone
From among the following, identify the compound which forms two moles of a ketone on ozonolysis.
[A] 2,3-Dimethylbutane.
[B] 3-Methyl-1-pentene.
[C] 2,3-Dimethyl-2-butene.
[D] 2-Methyl-2-pentane.
[A] 2,3-Dimethylbutane.
[B] 3-Methyl-1-pentene.
[C] 2,3-Dimethyl-2-butene.
[D] 2-Methyl-2-pentane.
MCQ+1 / -02023
31Aldehyde And Ketone
Which one of the following compounds would not undergo Aldol condensation?
MCQ+1 / -02023
32Aldehyde And Ketone
Which of the following is incorrect?
MCQ+1 / -02023
33Aldehyde And Ketone
Acetophenone when reacted with a base, \(\mathrm{C}_2 \mathrm{H}_5 \mathrm{ONa}\), yields a stable compound which has the structure
MCQ+1 / -02023
34Aldehyde And Ketone
Product of the following reaction is
MCQ+1 / -02023
35Aldehyde And Ketone
Find the product formed for the given reaction.
\(\mathrm{{C_6}{H_5}CHO + {H_3}C - C{H_2} - CHO\buildrel {Dil.\,NaOH/\Delta } \over \longrightarrow}\)
\(\mathrm{{C_6}{H_5}CHO + {H_3}C - C{H_2} - CHO\buildrel {Dil.\,NaOH/\Delta } \over \longrightarrow}\)
MCQ+1 / -02022
36Aldehyde And Ketone
X and Y in the following reactions are
MCQ+1 / -02022
37Aldehyde And Ketone
Reaction
find the product B.
find the product B.
MCQ+1 / -02021
38Aldehyde And Ketone
Find the final product for the reaction
MCQ+1 / -02021
39Aldehyde And Ketone
The reagent used in Clemmenson's reduction is
MCQ+1 / -02020
40Aldehyde And Ketone
The product formed when hydroxylamine
condenses with a carbonyl compound is called
condenses with a carbonyl compound is called
MCQ+1 / -02020