Aldehydes, Ketones And Carboxylic Acids Mock Test

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Quiz: Aldehydes, Ketones and Carboxylic Acids – Progressive Test
Total questions: 600
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Total rounds: 12
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1 / 50

1. The product obtained when ethanal undergoes self-aldol addition in cold dilute alkali is:

a) Butan--one

b) -Hydroxybutanal

c) But--enal

d) -Hydroxybutanal

2 / 50

2. Which equation represents Fischer esterification?

3 / 50

3. Salicylic acid is the common name of:

a) -Hydroxybenzoic acid

b) -Hydroxybenzoic acid

c) -Hydroxybenzoic acid

d) Benzene--dicarboxylic acid

4 / 50

4. Match each observation in Column I with the most suitable interpretation in Column II.

Column I	Column II
P. Methanal under ordinary conditions	1. Often a gas
Q. Ethanal	2. Volatile liquid
R. Many simple aldehydes and ketones	3. Commonly colourless when pure
S. Higher homologues	4. Less volatile liquids or solids may occur

a) P-2, Q-1, R-4, S-3

b) P-1, Q-2, R-3, S-4

c) P-1, Q-3, R-2, S-4

d) P-4, Q-2, R-1, S-3

5 / 50

5. A graph plots moles of carbon dioxide evolved against moles of a monocarboxylic acid added to a fixed amount of sodium bicarbonate. Which description is correct?

a) Falls with slope , then plateaus when all acid is consumed

b) Remains horizontal because bicarbonate acts only as a catalyst throughout

c) Rises with slope , then plateaus when bicarbonate is exhausted

d) Rises with slope , then continues linearly after bicarbonate is exhausted

6 / 50

6. Which sequence best represents the Hell-Volhard-Zelinsky reaction at recognition level?

a) Carboxylic acid primary alcohol aldehyde alpha-halo acid

b) Carboxylic acid ester enolate ion alpha-halo acid

c) Carboxylic acid carboxylate salt alkyl radical alpha-halo acid

d) Acid acyl halide alpha-halo acyl halide alpha-halo acid

7 / 50

7. The sequence that converts benzyl alcohol into benzene through benzoic acid is:

a) under pressure aqueous hydrolysis

b) oxidation soda-lime heating

c) PCC under controlled conditions excess

d) in aqueous alcohol under reflux hydrolysis

8 / 50

8. A compound has the structure . Its complete classification is:

a) Aromatic, unsaturated, and monoaldehydic

b) Aliphatic, unsaturated, and dialdehydic

c) Aliphatic, saturated, and monoaldehydic

d) Aromatic, saturated, and dialdehydic

9 / 50

9. Which statement about fatty acids is most accurate?

a) Every fatty acid is highly soluble in water regardless of chain length

b) Their sodium and potassium salts cannot act as soaps

c) They are hydrocarbons containing no oxygen

d) They are long-chain carboxylic acids that occur in many fats and oils

10 / 50

10. An unknown compound gives a positive -DNPH test, a negative Tollens test, and a yellow precipitate with iodine and alkali. The most suitable conclusion is:

a) It is most likely a methyl ketone

b) It contains no carbonyl group

c) It is an ordinary aldehyde lacking alpha hydrogen

d) It is definitely a carboxylic acid

11 / 50

11. Propanenitrile is to be converted into propan--ol through an aldehyde. Which sequence is appropriate?

a) Dilute , then

b) , then hot acidified

c) , hydrolysis, then

d) , hydrolysis, then

12 / 50

12. Which sequence converts ethanoic acid into ethane without losing a carbon atom?

a) Acyl chloride formation hydrolysis hydrogenation

b) Ethanol formation dehydration hydrogenation to ethane

c) Sodium salt formation soda-lime decarboxylation hydrogenation

d) Nitrile formation hydrolysis soda-lime decarboxylation

13 / 50

13. During Clemmensen reduction, the oxidation number of the carbonyl carbon decreases by the same amount for an aldehyde and a ketone. What is this decrease?

a) units

b) units

c) unit

d) units

14 / 50

14. Methanal and ethanal are present together in a total amount of . They react completely with excess ethylmagnesium bromide. After hydrolysis, propan--ol and butan--ol are isolated together in yield, giving of alcohol mixture. What was the mole percentage of methanal in the original mixture?

15 / 50

15. Which limitation applies when Fehling solution is used to classify aldehydes?

a) Fehling solution detects carboxylic acids exclusively

b) Every aromatic aldehyde always gives the same brick-red precipitate as an aliphatic aldehyde

c) Aromatic aldehydes may be negative under standard conditions even though they are aldehydes

d) Ordinary ketones always reduce Fehling solution faster than aldehydes

16 / 50

16. A mixture of benzoic acid and -nitrobenzoic acid requires exactly of sodium hydroxide for complete neutralisation. Which pair gives the mole percentage of -nitrobenzoic acid and the total mass of dry sodium salts formed? Use , , , and .

a) and

b) and

c) and

d) and

17 / 50

17. Propanal vapour occupies at and . In a Fehling test, of the propanal reacts. Copper(I) oxide forms quantitatively from the reacting aldehyde, while propanoic acid after acidification is recovered in yield. Which pair gives the mass and recovered acid mass? Use .

a) and

b) and

c) and

d) and

18 / 50

18. Match each compound with its common application.

Compound	Application
P. Methanal	1. Solvent for many laboratory and industrial materials
Q. Ethanal	2. Resin manufacture and controlled preservation use
R. Propanone	3. Chemical intermediate for preparing other compounds
S. Benzaldehyde	4. Flavour and fragrance manufacture

a) P-2, Q-3, R-1, S-4

b) P-1, Q-4, R-3, S-2

c) P-3, Q-2, R-4, S-1

d) P-4, Q-1, R-2, S-3

19 / 50

19. A diagram shows a dipole arrow along a carbonyl bond. The arrow should point:

a) From carbon to oxygen, with the positive end near carbon

b) From oxygen to carbon, with the positive end near carbon

c) From oxygen to carbon, with the positive end near oxygen

d) Perpendicular to the bond, with the positive end near oxygen

20 / 50

20. Which balanced equation represents the reaction of ethanoyl chloride with ammonia?

21 / 50

21. Clemmensen reduction is least suitable for a carbonyl compound containing:

a) An acid-sensitive functional group

b) A carbonyl group targeted for methylene conversion

c) A phenyl group attached to the carbonyl carbon

d) An alkyl group stable under strongly acidic conditions

22 / 50

22. Which use is correctly associated with methanoic acid?

a) Use as a concentrated sweetener in food manufacture

b) Controlled leather, textile, and rubber processing

c) Use as a strong base in antacid manufacture

d) Universal replacement for ethanoic acid in food preservation

23 / 50

23. Benzene is treated with , , , and . The isotope in the benzaldehyde product will be located at:

a) The carbonyl carbon of the formyl group

b) The ring carbon bonded to the formyl group

c) The aldehydic hydrogen

d) Every carbon atom of the aromatic ring

24 / 50

24. In the structure , the aldehydic hydrogen is the hydrogen:

a) Directly attached to the oxygen atom

b) Directly attached to the alpha carbon

c) Directly attached to the carbonyl carbon

d) Directly attached to the terminal methyl carbon

25 / 50

25. Assertion: Oxidation of a secondary alcohol normally preserves the number of carbon atoms in the product ketone.
Reason: Formation of the ketone involves conversion of the unit into without carbon-carbon bond cleavage.

a) Assertion is false, but Reason is true

b) Both Assertion and Reason are true, and Reason explains Assertion

c) Both Assertion and Reason are true, but Reason does not explain Assertion

d) Assertion is true, but Reason is false

26 / 50

26. A mixture of methanal and propanone reacts completely with excess methylmagnesium bromide, followed by hydrolysis. The resulting alcohol mixture is treated with acidified dichromate. Ethanol is oxidised according to

while tert-butanol does not react under the stated conditions. If of is consumed, what was the mole percentage of methanal in the original carbonyl mixture?

27 / 50

27. Hydrolysis of benzyl chloride, , does not directly give benzaldehyde because the principal product is:

a) Benzoic acid

b) Benzyl alcohol

c) Benzal chloride

d) Acetophenone

28 / 50

28. The compound is best classified as:

a) An aromatic unsymmetrical monoketone

b) An aliphatic symmetrical monoketone

c) An aromatic symmetrical diketone

d) An aromatic dialdehyde

29 / 50

29. Use the graph description below. The horizontal axis represents increasing stability of the enolate ion formed from a carbonyl compound. The vertical axis represents the of its alpha hydrogen. Which trend is expected?

a) Horizontal: enolate stability is unrelated to

b) Falling: greater enolate stability corresponds to lower

c) Rising: greater enolate stability corresponds to higher

d) Vertical: all enolates have the same

30 / 50

30. An impure propanone sample is treated with excess -DNPH. The derivative is isolated in yield, and of precipitate is obtained. If the derivative molar mass is , what is the purity of the propanone sample?

31 / 50

31. Complete reduction of a carbonyl compound gives of an alcohol. Combustion of this alcohol produces of and of . Mild oxidation of the alcohol regenerates a ketone. Which carbonyl compound was reduced?

a) Butan--one,

b) Propanone,

c) Propanal,

d) Ethanal,

32 / 50

32. A cyclohexanone ring bears a methyl group two ring positions away from the carbonyl carbon. The lowest-locant name is:

a) -Methylcyclohexanone

b) -Methylcyclohexanone

c) -Methylcyclohexanone

d) -Methylcyclohexanone

33 / 50

33. The principal role of copper during dehydrogenation of an alcohol is to:

a) Supply hydrogen for reduction of the alcohol

b) Provide a catalytic surface for removal of hydrogen

c) Supply oxygen atoms to form the carbonyl group

d) Convert the alcohol directly into a carboxylic acid

34 / 50

34. Equal portions of sodium bicarbonate and sodium carbonate are separately treated with excess monocarboxylic acid. The stoichiometric comparison is:

a) Bicarbonate consumes no acid, while carbonate consumes acid

b) Bicarbonate consumes acid and gives carbon dioxide; carbonate consumes acid and gives carbon dioxide

c) Bicarbonate consumes acid and gives carbon dioxide; carbonate consumes acid and gives carbon dioxide

d) Both reagents consume acid and give carbon dioxide

35 / 50

35. An alkyl halide containing carbon atoms is converted into a nitrile using , hydrolysed to a carboxylic acid, converted into its sodium salt, and subjected to Kolbe electrolysis. The coupled alkane contains ______ carbon atoms.

36 / 50

36. Consider the following statements about carboxylic acids.
Statement I: Lower members are often liquids with pungent odours.
Statement II: Higher members may be solids because intermolecular attractions increase with molecular size.
Statement III: Carboxylic acids cannot form intermolecular hydrogen bonds.

a) Statements I, II, and III

b) Statements I and III only

c) Statements I and II only

d) Statements II and III only

37 / 50

37. The interaction between the hydroxyl oxygen and the carbonyl system in a carboxylic acid involves donation of a lone pair into the adjacent ______ system.

a) Carbon-carbon single-bond

b) Pi-electron

c) Sigma-bond

d) Hydrogen-bond

38 / 50

38. Use the arrangements described below.
Structure P has a carbonyl carbon bonded to two hydrogen atoms.
Structure Q has a carbonyl carbon bonded to one hydrogen and one methyl group.
Structure R has a carbonyl carbon bonded to two methyl groups.
Which order represents increasing steric hindrance to nucleophile approach?

39 / 50

39. The structure is subjected to mild oxidation that converts only the aldehyde group into a carboxyl group. The name-product pair is:

a) -Hydroxybutan--one; -hydroxybutanoic acid

b) -Hydroxybutanal; -hydroxybutanoic acid

c) -Hydroxybutanal; butanedioic acid

d) -Hydroxybutanal; -hydroxybutanoic acid

40 / 50

40. A sample of ethanenitrile is completely converted into ethanal by Stephen reduction. What mass of ethanal is obtained, assuming complete conversion?

41 / 50

41. The structure represented by -methylhex--enal is:

42 / 50

42. A mixture contains benzaldehyde and acetone. Under conditions forming dibenzalacetone, of the benzaldehyde reacts. The product is isolated in yield, giving of dibenzalacetone. Which pair gives the initial mole percentage of benzaldehyde and the mass of unreacted acetone? Use .

a) and

b) and

c) and

d) and

43 / 50

43. Assertion: A simple acyclic ketone carbonyl cannot occupy carbon of its parent chain.
Reason: A ketone carbonyl carbon must be bonded to carbon groups on both sides.

a) Assertion is true, but Reason is false

b) Both Assertion and Reason are true, and Reason explains Assertion

c) Both Assertion and Reason are true, but Reason does not explain Assertion

d) Assertion is false, but Reason is true

44 / 50

44. A list treats hexan--one and hexan--one as separate compounds. The suitable correction is:

a) They are the same compound; numbering gives locant

b) They are functional isomers designated by locants and

c) They are position isomers with carbonyl locants and

d) They are chain isomers designated by locants and

45 / 50

45. A benzene ring carries groups at ring positions and . Its systematic name is:

a) Benzene--dicarbaldehyde

b) Benzene--dioic acid

c) Benzene--dial

d) -Dimethylbenzene--dione

46 / 50

46. Why do and groups direct incoming electrophiles mainly to the meta position?

a) Meta attack avoids any temporary loss of aromaticity in the sigma complex

b) Meta substitution converts the carbonyl substituent into an alcohol

c) Positive charge lies near the carbonyl group in ortho and para sigma complexes

d) Carbonyl oxygen donates electron density selectively to the meta position

47 / 50

47. Hydrolysis is carried out on of butan--one semicarbazone. The hydrolysis conversion is , and of the regenerated butan--one is recovered. What mass of ketone is isolated?

48 / 50

48. Acetophenone, , is reduced under Clemmensen conditions using of zinc and of hydrochloric acid. Use

After complete carbonyl reduction, excess zinc reacts with the remaining acid according to

Ethylbenzene is isolated in yield. Which pair gives its mass and the volume of hydrogen evolved at and ? Use .

a) and

b) and

c) and

d) and

49 / 50

49. Assertion: Methanoic acid can give a positive Tollens test even though it is a carboxylic acid.
Reason: Methanoic acid can be oxidised further to carbon dioxide and therefore acts as a reducing agent.

a) Assertion is false, but Reason is true

b) Assertion is true, but Reason is false

c) Both Assertion and Reason are true, but Reason does not explain Assertion

d) Both Assertion and Reason are true, and Reason explains Assertion

50 / 50

50. A tertiary alcohol produced by reacting propanone with an unknown Grignard reagent has molar mass . Combustion of of the alcohol gives of and of . Which Grignard reagent was used?

a) Methylmagnesium bromide

b) A propylmagnesium bromide

c) Ethylmagnesium bromide

d) A butylmagnesium bromide

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Aldehydes, Ketones and Carboxylic Acids Mock Test – Class 12 Chemistry

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