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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 the molecular formula of acetic acid?

C₂H₄O

C₂H₄O₂

CH₂O₂

C₃H₆O

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

NaOH

HCl

H₂SO₄

KOH

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

Alcohol

Amide

Salt and water

Ester

4. What is the structure of the carboxyl group?

–OH

–COOH

–COO⁻

–CH₃

5. What happens when a carboxylic acid is reduced?

Alkane is formed

Alcohol is formed

Ketone is formed

Ester is formed

6. Which of the following carboxylic acids is aromatic?

Acetic acid

Benzoic acid

Formic acid

Propanoic acid

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

Amide

Ether

Alcohol

Ester

8. Which functional group is present in carboxylic acids?

–OH

–COOCH₃

–CHO

–COOH

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

Benzoic acid

Acetic acid

Formic acid

Oxalic acid

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

Esterification

Saponification

Hydrolysis

Nitration

11. Which of the following has the highest acidity?

Acetic acid

Butanoic acid

Formic acid

Propanoic acid

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

~3–5

~9–10

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

Sodium acetate

CH₄

Ethanol

Acetone

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

Baeyer’s test

Bromine water test

Tollen’s test

Sodium bicarbonate test

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

Decrease acidity

No effect

Make it neutral

Increase acidity

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

Reduction of ketones

Oxidation of aldehydes

Oxidation of primary alcohols

Hydrolysis of nitriles

17. What happens when carboxylic acid reacts with alcohol?

Aldehyde is formed

Acid anhydride is formed

Ketone is formed

Ester is formed

18. What is the common name of methanoic acid?

Oxalic acid

Propionic acid

Formic acid

Acetic acid

19. What is the IUPAC name for CH₃CH₂COOH?

Propanoic acid

Formic acid

Butanoic acid

Ethanoic acid

20. Which group increases the acidity of carboxylic acids?

–CH₃

–NO₂

–NH₂

–OH

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

Bitter in taste

Sharp sour taste and high boiling point

Insoluble in water

High volatility

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

HCl

NaOH

H₂O

SOCl₂

23. Which of the following is a dicarboxylic acid?

Oxalic acid

Acetic acid

Formic acid

Propanoic acid

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

Ester

Alcohol

Ketone

Aldehyde

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

NH₄OH

NaOH

HCl

KMnO₄

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26. Carboxylic acids are classified as:

Aldehydes

Alcohols

Amines

Organic acids

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

Formic acid

Acetic acid

Methanoic acid

Ethanoic acid

28. What is the IUPAC name of tartaric acid?

Butanoic acid

2-Hydroxypropanoic acid

Hydroxyethanoic acid

2,3-Dihydroxybutanedioic acid

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

Ester

Aldehyde

Alcohol

Acyl chloride

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

NH₃

CH₃COOH

HCl

NaOH

31. Which of the following acids is tribasic?

Formic acid

Citric acid

Propanoic acid

Acetic acid

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

Liquid

Plasma

Gas

Solid

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

LiAlH₄

NaBH₄

Br₂

H₂O/H⁺

34. What is the by-product of esterification?

H₂

H₂O

NH₃

CO₂

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

PCC

LiAlH₄

KMnO₄

H₂SO₄

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

Irregular pattern

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

Decreases with molar mass

Unaffected by chain length

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

Formic acid

Citric acid

Oxalic acid

Acetic acid

38. Which carboxylic acid is naturally found in vinegar?

Acetic acid

Citric acid

Lactic acid

Formic acid

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

Acyl chlorides

Water

Alcohols

Another carboxylic acid

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

Presence of carbonyl and hydroxyl in –COOH

Aromatic nature

High molecular weight

Presence of hydroxyl group

41. Which of the following is the strongest acid?

Formic acid

Acetic acid

Water

Ethanol

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

Oxalic acid

Acetic acid

Propanoic acid

Formic acid

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

Acetic acid

Pentanoic acid

Formic acid

Butanoic acid

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

Strong base

High melting point

Acidic behavior

Hydrogen bonding

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

Tollens reagent

Litmus paper

Benedict’s solution

Fehling’s solution

46. What is the IUPAC name for CH₃COOH?

Formic acid

Ethanoic acid

Methanoic acid

Acetic acid

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

Acetic acid + NaOH

Formic acid + alcohol

Benzoic acid + water

Acetic acid + ammonia

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

Nitration

Oxidation of aldehydes

Polymerization

Addition of alkenes

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

SOCl₂

H₂O

Alcohol

NaOH

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

Covalent bonding

Van der Waals forces

Ionic bonding

Hydrogen bonding

Complete Guide for Chemistry Carboxylic Acid Online Mcqs Test

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Important Chemistry Carboxylic Acid Question and Answer

Chemistry Carboxylic Acid Practice Test Online With Explanation

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