75 free MCQs on Aldehydes, Ketones and Carboxylic Acids, each with its own worked answer and explanation. Aldehydes, ketones, carboxylic acids, and their derivatives (esters, amides, acid chlorides). Key reactions include nucleophilic addition, Aldol condensation, Cannizzaro, and Claisen. Very heavily tested in JEE and NEET.
Take the timed Aldehydes, Ketones and Carboxylic Acids chapterwise test →75 practice questions on Aldehydes, Ketones and Carboxylic Acids, sorted Easy → Hard. Try each one first, then open its answer page for the worked explanation. Want the full theory first? Read the Aldehydes, Ketones and Carboxylic Acids notes.
Curved arrows show the nucleophile attacking the carbonyl carbon while the C=O pi electrons move onto oxygen, giving a tetrahedral alkoxide intermediate.
Q1.
Which functional group characterises a carboxylic acid?
Q2.
The IUPAC name of CH<sub>3</sub>COOH is:
Q3.
The common name of HCOOH is:
Q4.
The acid present in vinegar is:
Q5.
Carboxylic acids have unusually high boiling points mainly because they:
Q6.
Which functional group is present in aldehydes?
Q7.
Which functional group is present in ketones?
Q8.
What is the IUPAC name of HCHO?
Q9.
What is the IUPAC name of CH<sub>3</sub>CHO?
Q10.
What is the IUPAC name of CH<sub>3</sub>COCH<sub>3</sub>?
Q11.
Which compound gives a positive Tollens' test?
Q12.
Tollens' reagent is an ammoniacal solution of:
Q13.
Fehling's solution gives a brick-red precipitate with:
Q14.
Which compound does NOT give a positive Tollens' test?
Q15.
What is the common name of methanal?
Q16.
What is the common name of ethanal?
Q17.
What is the common name of propanone?
Q18.
Nucleophilic addition reactions are characteristic of:
Q19.
Schiff's reagent is decolourised by:
Q20.
Oxidation of a primary alcohol gives:
Q21.
Oxidation of a secondary alcohol gives:
Q22.
Formaldehyde is used in the manufacture of:
Q23.
Which solution is used to preserve biological specimens?
Q24.
Which compound has a carbonyl group at the end of the carbon chain?
Q25.
Which is the simplest ketone?
Q26.
Which of the following is the strongest acid?
Q27.
Which of these monohalogenated acetic acids is the strongest acid?
Q28.
Acidic hydrolysis of ethanenitrile (CH<sub>3</sub>CN) gives:
Q29.
In the Hell-Volhard-Zelinsky reaction, a carboxylic acid bearing an alpha-hydrogen reacts with Cl<sub>2</sub> and red phosphorus to give:
Q30.
Heating sodium ethanoate with soda lime produces:
Q31.
Aldol condensation requires an aldehyde or ketone having:
Q32.
What is the product of aldol condensation of acetaldehyde followed by dehydration?
Q33.
Cannizzaro reaction is a disproportionation shown by aldehydes with:
Q34.
Which compound undergoes the Cannizzaro reaction?
Q35.
Clemmensen reduction converts a carbonyl group to:
Q36.
Wolf-Kishner reduction uses which reagents?
Q37.
What is the product when acetone reacts with HCN?
Q38.
Grignard reagent reacts with formaldehyde to give (after hydrolysis):
Q39.
Grignard reagent reacts with a non-formaldehyde aldehyde to give (after hydrolysis):
Q40.
Grignard reagent reacts with a ketone to give (after hydrolysis):
Q41.
Fehling's test is NOT given by:
Q42.
Rosenmund reduction converts an acid chloride to:
Q43.
What is the product of the reaction of acetaldehyde with hydroxylamine?
Q44.
Which reagent converts toluene to benzaldehyde?
Q45.
What type of reaction occurs when acetaldehyde reacts with semicarbazide?
Q46.
Which product is formed in the Perkin reaction of benzaldehyde with acetic anhydride?
Q47.
Which compound gives a yellow precipitate with 2,4-dinitrophenylhydrazine?
Q48.
Acetaldehyde on treatment with excess ethanol and dry HCl gives:
Q49.
Which carbonyl compound is least reactive towards nucleophilic addition?
Q50.
What is the major product when benzaldehyde undergoes Cannizzaro reaction with NaOH?
Q51.
Which test distinguishes formic acid from acetic acid?
Q52.
The correct order of reactivity toward nucleophilic acyl substitution is:
Q53.
Reduction of ethanoic acid with LiAlH<sub>4</sub> gives:
Q54.
Which compound liberates CO<sub>2</sub> on treatment with aqueous NaHCO<sub>3</sub>?
Q55.
In the acid-catalysed esterification of ethanoic acid with ethanol, the eliminated water molecule is formed from:
Q56.
Which compound gives a positive iodoform test but a negative Tollens' test?
Q57.
The iodoform test is positive for compounds containing the group:
Q58.
In the Cannizzaro reaction mechanism, which species undergoes oxidation?
Q59.
Which of these undergoes intramolecular Cannizzaro reaction?
Q60.
Why is benzaldehyde less reactive than acetaldehyde towards nucleophilic addition?
Q61.
What is the product of treating acetaldehyde with dilute NaOH?
Q62.
Meerwein-Ponndorf-Verley reduction transfers a hydride from:
Q63.
Which type of isomerism is shown by CH<sub>3</sub>CHO and HOCH=CH<sub>2</sub>?
Q64.
Which compound gives a positive iodoform test?
Q65.
The order of reactivity towards nucleophilic addition is:
Q66.
In the aldol condensation, the alpha carbon acts as:
Q67.
What is the product of the reaction of formaldehyde with excess Grignard reagent (RMgX)?
Q68.
Which compound undergoes self-condensation to give diacetone alcohol?
Q69.
Acrolein (propenal) is formed by dehydration of:
Q70.
In Beckmann rearrangement, an oxime is converted to:
Q71.
Acetaldehyde reacts with excess methanol in the presence of dry HCl to form:
Q72.
Which statement about Knoevenagel condensation is correct?
Q73.
What is the alpha carbon in acetone (CH<sub>3</sub>COCH<sub>3</sub>)?
Q74.
Which compound is formed when two molecules of formaldehyde undergo Cannizzaro reaction?
Q75.
The reaction of acetaldehyde with ammonia gives paraldehyde by:
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