Reactions of Carboxylic Acids - UNSOLVED PRACTICE SET
Chapter: Aldehydes Ketones and Carboxylic Acids | Topic: Reactions of Carboxylic Acids
REACTIONS OF CARBOXYLIC ACIDS - UNSOLVED PRACTICE SET
Topic: Reactions of Carboxylic Acids
Multiple Choice Questions
Q1. Which of the following reactions of carboxylic acids produces an ester with a fruity smell?
- Reaction with PCl₅
- Reaction with alcohol in presence of acid catalyst
- Reaction with soda lime
- Reaction with NH₃ followed by heating
Q2. When benzoic acid is treated with PCl₅, the product formed is:
- Benzoyl chloride
- Benzaldehyde
- Phenyl acetyl chloride
- Benzoic anhydride
Q3. The decarboxylation of sodium salt of a carboxylic acid with soda lime produces:
- An alkene
- An alkane with one carbon less
- An alcohol
- An ester
Q4. Which reagent converts a carboxylic acid directly into an amide?
- NH₃, then heat
- PCl₅, then NH₃
- Both (a) and (b)
- Only PCl₅
Q5. During esterification of a carboxylic acid with an alcohol, the role of concentrated H₂SO₄ is:
- Only as a dehydrating agent
- Only as a catalyst
- Both as a catalyst and dehydrating agent
- As an oxidizing agent
Q6. The reaction of carboxylic acid with LiAlH₄ gives:
- An alkane
- A primary alcohol
- An aldehyde
- A ketone
Short Answer Questions
Q7. Write the chemical equation for the reaction of ethanoic acid with ethanol in the presence of concentrated H₂SO₄. Name the product and the type of reaction.
Q8. How will you convert benzoic acid to benzoyl chloride? Write the balanced chemical equation and name the reagent used.
Q9. Explain why carboxylic acids are stronger acids than phenols. (Consider resonance stabilization of the conjugate base.)
Q10. Write the products formed when propanoic acid reacts with:
(i) Ammonia, followed by heating
(ii) Soda lime (NaOH + CaO), heat
Q11. Your mother uses vinegar (acetic acid) while making pickles. She also uses baking soda (NaHCO₃) while making cakes. What happens when she accidentally mixes a little vinegar with baking soda? Write the chemical equation and name the gas evolved.
Q12. Arrange the following compounds in increasing order of acidic strength. Give reason:
CH₃COOH, ClCH₂COOH, CH₃CH₂COOH, FCH₂COOH
Long Answer Questions
Q13. Describe the following reactions of carboxylic acids with suitable examples and balanced equations:
(i) Esterification
(ii) Reduction with LiAlH₄
(iii) Decarboxylation
Q14. Explain the mechanism of esterification of a carboxylic acid with an alcohol. Why is the reaction reversible? How can the yield of ester be increased?
Q15. A student in the chemistry lab has four bottles containing: acetic acid, ethanol, ethyl acetate, and sodium acetate. Using simple chemical tests, how can the student distinguish between acetic acid and ethyl acetate? Also, explain how sodium acetate can be converted back to acetic acid.
Numerical / Application-Based Problems
Q16. A monobasic carboxylic acid 'A' (C₃H₆O₂) reacts with ethanol to give a compound 'B' with a fruity smell. 'B' on treatment with NaOH followed by acidification gives back 'A' and ethanol. Identify 'A' and 'B'. Write all the chemical equations involved. Calculate the molecular mass of 'B'.
Q17. In a school science fair, a student demonstrates that 6.0 g of an organic compound (molecular mass = 60 g/mol) reacts completely with sodium bicarbonate to produce 2.24 L of CO₂ gas at STP. Identify the functional group present in the compound and write the balanced chemical equation. Is this compound more acidic or less acidic than phenol? Justify.
Q18. 0.5 mole of a saturated monocarboxylic acid is completely neutralized by 20.0 g of NaOH. Determine the molecular formula of the acid. Write the reaction of this acid with PCl₅ and name the product formed.