Q. What is the effect of increasing the carbon chain length on the acidity of carboxylic acids?
A.
Increases acidity
B.
Decreases acidity
C.
No effect
D.
Varies with structure
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Solution
Increasing the carbon chain length generally decreases the acidity of carboxylic acids due to the inductive effect.
Correct Answer:
B
— Decreases acidity
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Q. What is the effect of increasing the number of carbon atoms in a carboxylic acid on its acidity?
A.
Increases acidity
B.
Decreases acidity
C.
No effect
D.
Depends on the structure
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Solution
As the number of carbon atoms increases, the acidity generally decreases due to the increasing electron-donating effect of alkyl groups.
Correct Answer:
B
— Decreases acidity
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Q. What is the effect of increasing the number of carbon atoms in a carboxylic acid on its solubility in water?
A.
Increases solubility
B.
Decreases solubility
C.
No effect
D.
First increases then decreases
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Solution
As the number of carbon atoms increases, the solubility of carboxylic acids in water generally decreases due to the increasing hydrophobic character.
Correct Answer:
B
— Decreases solubility
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Q. What is the functional group present in carboxylic acids?
A.
Hydroxyl group
B.
Carbonyl group
C.
Carboxyl group
D.
Amino group
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Solution
Carboxylic acids contain the carboxyl group (-COOH), which is the defining feature of this class of compounds.
Correct Answer:
C
— Carboxyl group
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Q. What is the general formula for carboxylic acids?
A.
C_nH_2nO_2
B.
C_nH_2n+1COOH
C.
C_nH_2nO
D.
C_nH_2n+2O
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Solution
The general formula for carboxylic acids is C_nH_2nO_2.
Correct Answer:
A
— C_nH_2nO_2
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Q. What is the IUPAC name of CH3COOH?
A.
Methanoic acid
B.
Ethanoic acid
C.
Propanoic acid
D.
Butanoic acid
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Solution
CH3COOH is known as Ethanoic acid in IUPAC nomenclature.
Correct Answer:
B
— Ethanoic acid
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Q. What is the main product when a carboxylic acid is reduced?
A.
Alcohol
B.
Aldehyde
C.
Ketone
D.
Alkane
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Solution
The main product of the reduction of a carboxylic acid is an alcohol.
Correct Answer:
A
— Alcohol
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Q. What is the main product when benzoic acid is treated with thionyl chloride?
A.
Benzoyl chloride
B.
Benzyl alcohol
C.
Benzene
D.
Benzoate salt
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Solution
Thionyl chloride (SOCl2) converts benzoic acid to benzoyl chloride, which is an acyl chloride.
Correct Answer:
A
— Benzoyl chloride
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Q. What is the main product when butanoic acid is treated with thionyl chloride?
A.
Butyl chloride
B.
Butanoate
C.
Butanoyl chloride
D.
Butanol
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Solution
The reaction of butanoic acid with thionyl chloride produces butanoyl chloride.
Correct Answer:
C
— Butanoyl chloride
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Q. What is the main product when propanoic acid is treated with thionyl chloride?
A.
Propyl chloride
B.
Propanoic anhydride
C.
Propionyl chloride
D.
Propylene
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Solution
The reaction of propanoic acid with thionyl chloride produces propionyl chloride.
Correct Answer:
C
— Propionyl chloride
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Q. What is the pKa value of acetic acid?
A.
4.76
B.
7.00
C.
9.25
D.
2.00
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Solution
The pKa value of acetic acid is approximately 4.76.
Correct Answer:
A
— 4.76
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Q. What is the primary product of the reaction between a carboxylic acid and an alcohol in the presence of an acid catalyst?
A.
Aldehyde
B.
Ester
C.
Ketone
D.
Amide
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Solution
The reaction between a carboxylic acid and an alcohol in the presence of an acid catalyst produces an ester.
Correct Answer:
B
— Ester
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Q. What is the primary product when a carboxylic acid is reduced with lithium aluminum hydride (LiAlH4)?
A.
Alcohol
B.
Aldehyde
C.
Ketone
D.
Ester
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Solution
Lithium aluminum hydride reduces carboxylic acids to primary alcohols.
Correct Answer:
A
— Alcohol
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Q. What is the primary product when a carboxylic acid reacts with thionyl chloride (SOCl2)?
A.
Acid chloride
B.
Ester
C.
Alcohol
D.
Aldehyde
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Solution
The primary product of the reaction between a carboxylic acid and thionyl chloride is an acid chloride.
Correct Answer:
A
— Acid chloride
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Q. What is the product of the decarboxylation of sodium acetate?
A.
Methane
B.
Ethane
C.
Carbon dioxide
D.
Acetic acid
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Solution
Decarboxylation of sodium acetate produces methane.
Correct Answer:
A
— Methane
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Q. What is the product of the esterification reaction between acetic acid and ethanol?
A.
Ethyl acetate
B.
Acetic anhydride
C.
Ethanol acetate
D.
Acetic acid
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Solution
The reaction between acetic acid and ethanol produces ethyl acetate.
Correct Answer:
A
— Ethyl acetate
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Q. What is the product of the reaction between a carboxylic acid and an alcohol?
A.
Amide
B.
Ester
C.
Aldehyde
D.
Ketone
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Solution
The reaction between a carboxylic acid and an alcohol produces an ester.
Correct Answer:
B
— Ester
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Q. What is the product of the reaction between acetic acid and sodium bicarbonate?
A.
Sodium acetate
B.
Carbon dioxide
C.
Water
D.
All of the above
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Solution
The reaction produces sodium acetate, carbon dioxide, and water, making 'All of the above' the correct answer.
Correct Answer:
D
— All of the above
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Q. Which of the following acids is stronger than acetic acid?
A.
Formic acid
B.
Propanoic acid
C.
Butanoic acid
D.
Valeric acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid (CH3COOH).
Correct Answer:
A
— Formic acid
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Q. Which of the following acids is the strongest?
A.
Formic acid
B.
Acetic acid
C.
Propanoic acid
D.
Butanoic acid
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Solution
Formic acid (HCOOH) is stronger than acetic acid and other listed acids.
Correct Answer:
A
— Formic acid
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Q. Which of the following carboxylic acids is a dicarboxylic acid?
A.
Acetic acid
B.
Oxalic acid
C.
Formic acid
D.
Butanoic acid
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Solution
Oxalic acid is a dicarboxylic acid as it contains two carboxyl groups (-COOH).
Correct Answer:
B
— Oxalic acid
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Q. Which of the following carboxylic acids is a solid at room temperature?
A.
Acetic acid
B.
Formic acid
C.
Stearic acid
D.
Propanoic acid
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Solution
Stearic acid is a long-chain fatty acid and is solid at room temperature.
Correct Answer:
C
— Stearic acid
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Q. Which of the following compounds can be formed by the decarboxylation of a carboxylic acid?
A.
Alkane
B.
Alkene
C.
Alkyne
D.
Aldehyde
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Solution
Decarboxylation of a carboxylic acid typically yields an alkane.
Correct Answer:
A
— Alkane
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Q. Which of the following compounds can be formed by the decarboxylation of sodium acetate?
A.
Methane
B.
Ethane
C.
Propane
D.
Butane
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Solution
Decarboxylation of sodium acetate yields methane.
Correct Answer:
A
— Methane
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Q. Which of the following compounds can be formed by the esterification of a carboxylic acid?
A.
Alcohol
B.
Ester
C.
Amide
D.
Aldehyde
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Solution
Ester is formed by the reaction of a carboxylic acid with an alcohol in an esterification reaction.
Correct Answer:
B
— Ester
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Q. Which of the following compounds can be formed by the esterification of acetic acid?
A.
Ethyl acetate
B.
Methyl acetate
C.
Butyl acetate
D.
All of the above
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Solution
All of the listed compounds can be formed by the esterification of acetic acid with the respective alcohols.
Correct Answer:
D
— All of the above
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Q. Which of the following compounds is a derivative of carboxylic acid?
A.
Alcohol
B.
Ester
C.
Aldehyde
D.
Ketone
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Solution
Esters are derivatives of carboxylic acids formed by the reaction of an acid and an alcohol.
Correct Answer:
B
— Ester
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Q. Which of the following is a characteristic property of carboxylic acids?
A.
High boiling points
B.
Low solubility in water
C.
Sweet smell
D.
Basic nature
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Solution
Carboxylic acids have high boiling points due to hydrogen bonding.
Correct Answer:
A
— High boiling points
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Q. Which of the following is a characteristic reaction of carboxylic acids?
A.
Formation of esters
B.
Formation of amides
C.
Decarboxylation
D.
All of the above
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Solution
Carboxylic acids can undergo esterification, amide formation, and decarboxylation, making 'All of the above' correct.
Correct Answer:
D
— All of the above
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Q. Which of the following is a derivative of carboxylic acid?
A.
Alcohol
B.
Aldehyde
C.
Ester
D.
Alkane
Show solution
Solution
Ester is a derivative of carboxylic acid formed by the reaction of an acid with an alcohol.
Correct Answer:
C
— Ester
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Showing 1 to 30 of 43 (2 Pages)
Carboxylic Acids & Derivatives MCQ & Objective Questions
Carboxylic acids and their derivatives are crucial topics in chemistry that frequently appear in school and competitive exams. Understanding these concepts not only enhances your grasp of organic chemistry but also boosts your performance in exams. Practicing MCQs and objective questions related to carboxylic acids helps you identify important questions and solidify your knowledge, making exam preparation more effective.
What You Will Practise Here
Definition and properties of carboxylic acids
Classification of carboxylic acids and their derivatives
Reactions involving carboxylic acids, including esterification and decarboxylation
Key formulas related to acidity and pKa values
Identification of functional groups in carboxylic acid derivatives
Mechanisms of important reactions
Diagrams illustrating structural formulas and reaction pathways
Exam Relevance
Carboxylic acids and their derivatives are significant topics in various examinations including CBSE, State Boards, NEET, and JEE. Questions often focus on the properties, reactions, and applications of these compounds. Common patterns include direct application of concepts in MCQs, numerical problems involving acidity, and theoretical questions that test your understanding of reaction mechanisms.
Common Mistakes Students Make
Confusing the properties of carboxylic acids with those of alcohols and phenols
Overlooking the importance of functional groups in derivatives
Misunderstanding reaction mechanisms, leading to incorrect predictions of products
Neglecting to memorize key formulas and pKa values
FAQs
Question: What are the main types of carboxylic acid derivatives?Answer: The main types include esters, amides, anhydrides, and acid chlorides.
Question: How do carboxylic acids differ from alcohols?Answer: Carboxylic acids contain a carboxyl group (-COOH) which makes them more acidic than alcohols, which have a hydroxyl group (-OH).
Start solving practice MCQs on carboxylic acids and derivatives today to test your understanding and improve your exam readiness. Master these important concepts and boost your confidence for your upcoming exams!
