Chemistry Carboxylic Acid Online Mcqs Test

Mustansar KhanLast Updated: October 15, 2025

Important Chemistry Carboxylic Acid Question and Answer

Total Questions:	50
Time Allowed:	30 Minutes
Total Marks:	50
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	Chemistry Test ECAT Test MDCAT Test FPSC/PPSC/SPSC/KPPSC/BPSC/AJKPSC/NTS Chemistry Interview Question Answer

Chemistry Carboxylic Acid Practice Test Online With Explanation

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1. Which of the following is least soluble in water?

Pentanoic acid

Formic acid

Butanoic acid

Acetic acid

2. Which carboxylic acid is used as a food preservative?

Formic acid

Oxalic acid

Acetic acid

Benzoic acid

3. Which functional group is present in carboxylic acids?

–COOCH₃

–COOH

–OH

–CHO

4. Which of the following reacts with carboxylic acid to give an acid chloride?

NaOH

HCl

H₂O

SOCl₂

5. Which property of carboxylic acids makes them good hydrogen bond donors?

Presence of hydroxyl group

Presence of carbonyl and hydroxyl in –COOH

High molecular weight

Aromatic nature

6. Which of the following properties is NOT associated with carboxylic acids?

Strong base

High melting point

Acidic behavior

Hydrogen bonding

7. Which reaction converts a carboxylic acid to an ester?

Nitration

Esterification

Saponification

Hydrolysis

8. Which of the following is not a method of preparing carboxylic acids?

Oxidation of primary alcohols

Oxidation of aldehydes

Reduction of ketones

Hydrolysis of nitriles

9. Which of the following carboxylic acids is aromatic?

Benzoic acid

Acetic acid

Formic acid

Propanoic acid

10. Which of the following compounds is the simplest carboxylic acid?

Oxalic acid

Propanoic acid

Formic acid

Acetic acid

11. Which of the following acids is tribasic?

Citric acid

Formic acid

Propanoic acid

Acetic acid

12. Which of the following is an example of esterification?

Acetic acid + NaOH

Formic acid + alcohol

Acetic acid + ammonia

Benzoic acid + water

13. What is the boiling point trend in carboxylic acids?

Unaffected by chain length

Increases with molar mass due to stronger van der Waals and hydrogen bonding

Irregular pattern

Decreases with molar mass

14. What is the IUPAC name of tartaric acid?

Hydroxyethanoic acid

Butanoic acid

2,3-Dihydroxybutanedioic acid

2-Hydroxypropanoic acid

15. Which of the following is the molecular formula of acetic acid?

CH₂O₂

C₂H₄O

C₂H₄O₂

C₃H₆O

16. What is formed when carboxylic acid reacts with a base?

Salt and water

Alcohol

Amide

Ester

17. Which of the following carboxylic acids occurs naturally in citrus fruits?

Formic acid

Oxalic acid

Citric acid

Acetic acid

18. Which of the following is the strongest acid?

Water

Formic acid

Ethanol

Acetic acid

19. Which carboxylic acid is naturally found in vinegar?

Formic acid

Acetic acid

Lactic acid

Citric acid

20. Which of the following is a physical property of carboxylic acids?

Insoluble in water

High volatility

Sharp sour taste and high boiling point

Bitter in taste

21. What happens when a carboxylic acid is reduced?

Ketone is formed

Ester is formed

Alkane is formed

Alcohol is formed

22. Which reagent converts a nitrile into a carboxylic acid?

NaBH₄

H₂O/H⁺

LiAlH₄

Br₂

23. What is the pKa value of a typical carboxylic acid?

~9–10

~3–5

24. Which of the following is a dicarboxylic acid?

Oxalic acid

Propanoic acid

Formic acid

Acetic acid

25. Which of the following compounds is formed when acetic acid is treated with NaHCO₃?

Sodium acetate

Acetone

CH₄

Ethanol

Page 2 of 2

26. Which catalyst is commonly used in esterification of carboxylic acids?

H₂SO₄

KOH

NaOH

HCl

27. Which of the following is a common laboratory reagent used to oxidize alcohols to carboxylic acids?

NH₄OH

NaOH

KMnO₄

HCl

28. What happens when carboxylic acid reacts with alcohol?

Ester is formed

Aldehyde is formed

Acid anhydride is formed

Ketone is formed

29. Which of the following is the correct IUPAC name for HCOOH?

Methanoic acid

Ethanoic acid

Formic acid

Acetic acid

30. What is the effect of electron-withdrawing groups on the acidity of carboxylic acids?

No effect

Decrease acidity

Increase acidity

Make it neutral

31. What is the by-product of esterification?

NH₃

CO₂

H₂

H₂O

32. Which of the following will not react with carboxylic acid?

NaOH

Alcohol

SOCl₂

H₂O

33. Which of the following has the highest acidity?

Propanoic acid

Formic acid

Butanoic acid

Acetic acid

34. Which of the following is used to test the acidic nature of carboxylic acids?

Fehling’s solution

Litmus paper

Tollens reagent

Benedict’s solution

35. When carboxylic acids are heated with alcohols in the presence of acid, what is formed?

Alcohol

Aldehyde

Ketone

Ester

36. Carboxylic acids are classified as:

Aldehydes

Organic acids

Alcohols

Amines

37. What is the physical state of formic acid at room temperature?

Liquid

Plasma

Solid

Gas

38. Which group increases the acidity of carboxylic acids?

–NH₂

–NO₂

–OH

–CH₃

39. Which method is commonly used to prepare carboxylic acids?

Oxidation of aldehydes

Nitration

Addition of alkenes

Polymerization

40. What is the product of the reaction of carboxylic acid with PCl₅?

Acyl chloride

Aldehyde

Ester

Alcohol

41. What is the result of the reaction between a carboxylic acid and ammonia?

Ether

Amide

Alcohol

Ester

42. Which of the following reacts with carboxylic acids to form acid anhydrides?

Alcohols

Water

Another carboxylic acid

Acyl chlorides

43. What is the IUPAC name for CH₃COOH?

Methanoic acid

Ethanoic acid

Formic acid

Acetic acid

44. Which base is commonly used in saponification of esters?

NH₃

NaOH

HCl

CH₃COOH

45. What is the IUPAC name for CH₃CH₂COOH?

Propanoic acid

Formic acid

Ethanoic acid

Butanoic acid

46. What is the common name of methanoic acid?

Oxalic acid

Acetic acid

Propionic acid

Formic acid

47. What is the structure of the carboxyl group?

–OH

–COO⁻

–CH₃

–COOH

48. Which type of bonding causes high boiling points in carboxylic acids?

Hydrogen bonding

Van der Waals forces

Ionic bonding

Covalent bonding

49. Which of the following is a test for carboxylic acids?

Sodium bicarbonate test

Baeyer’s test

Bromine water test

Tollen’s test

50. Which reagent is used to reduce carboxylic acids to alcohols?

KMnO₄

PCC

H₂SO₄

LiAlH₄

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Mustansar KhanLast Updated: October 15, 2025

Important Chemistry Carboxylic Acid Question and Answer

Chemistry Carboxylic Acid Practice Test Online With Explanation

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