Why is thionyl chloride often preferred over PCl₅ for converting a carboxylic acid into an acyl chloride?
Correct answer C. The by-products SO₂ and HCl are gases and escape easily
Topic / 36 questions
Carboxylic Acids MCQs
Page 2 of Carboxylic Acids multiple-choice questions with answers. Tap an option to check yourself.
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- Gases 40
- Liquids 40
- Solids 40
- Chemical Equilibrium 40
- Reaction Kinetics 40
- Thermochemistry and Energetics 40
- Electrochemistry 40
- Fundamental Concepts of Chemistry 40
- Atomic Structure 39
- Chemical Bonding 39
- Alcohols and Phenols 38
- Industrial Chemistry 37
- Aldehydes and Ketones 37
- Alkyl Halides 37
- s- and p-Block Elements 37
- Chemistry of Hydrocarbons 36
- Fundamental Principles of Organic Chemistry 36
- Carboxylic Acids 36
- Transition Elements 35
- Macromolecules 35
When ethanoic acid reacts with phosphorus trichloride, what are the products?
Correct answer D. Ethanoyl chloride and phosphonic acid (H₃PO₃)
Heating ethanoic acid with phosphorus(V) oxide, a strong dehydrating agent, gives ____.
Correct answer C. Ethanoic anhydride
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Which ester forms when ethanoic acid is heated with methanol and a few drops of concentrated H₂SO₄?
Correct answer C. Methyl ethanoate
What is formed when ammonium ethanoate is heated strongly?
Correct answer A. Ethanamide
Which reagent reduces ethanoic acid to ethanol?
Correct answer D. LiAlH₄ in dry ether
What is the correct order of reactivity of acid derivatives towards nucleophilic acyl substitution?
Correct answer C. Acyl chloride > anhydride > ester > amide
What is the IUPAC name of CH₃CH₂COOH?
Correct answer D. Propanoic acid
Take Ka = 1.8 × 10⁻⁵ mol/dm³. What is the pH of 0.10 mol/dm³ ethanoic acid?
Correct answer D. 2.87
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Which of the following is the strongest acid?
Correct answer C. Trichloroethanoic acid
Which conditions convert ethanol into ethanoic acid?
Correct answer B. Heating under reflux with excess acidified K₂Cr₂O₇
Methylmagnesium bromide is treated with dry CO₂ and then dilute acid. Which product forms?
Correct answer A. Ethanoic acid
Which carboxylic acid is formed by acid hydrolysis of propanenitrile, CH₃CH₂CN?
Correct answer D. Propanoic acid
Ethanoic acid shows a relative molecular mass of about 120 in benzene solution. What is the best explanation?
Correct answer D. It forms hydrogen-bonded dimers
What is the IUPAC name of (CH₃)₂CHCOOH?
Correct answer B. 2-Methylpropanoic acid
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What is the IUPAC name of formic acid, HCOOH?
Correct answer A. Methanoic acid