In the esterification of ethanol with ethanoic acid, what is the main role of concentrated H₂SO₄?
Correct answer A. It acts as a catalyst and absorbs the water formed
Topic / 38 questions
Alcohols and Phenols MCQs
Page 2 of Alcohols and Phenols 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
Why does ethanol (M = 46 g/mol) boil at a much higher temperature than propane (M = 44 g/mol)?
Correct answer C. Ethanol molecules form hydrogen bonds with one another
Why is phenol a stronger acid than ethanol?
Correct answer A. The phenoxide ion is stabilised by delocalisation of its charge into the benzene ring
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What is observed when aqueous bromine is added to phenol solution at room temperature?
Correct answer A. The bromine is decolourised and a white precipitate forms
Phenol reacts with dilute nitric acid at room temperature to give mainly ____.
Correct answer B. A mixture of 2-nitrophenol and 4-nitrophenol
Which reagent gives a violet colour with phenol but no colour with ethanol?
Correct answer A. Neutral iron(III) chloride solution
A compound dissolves in aqueous NaOH but does not release CO₂ with NaHCO₃. Which compound fits this behaviour?
Correct answer B. Phenol
How does the OH group affect electrophilic substitution in the benzene ring of phenol?
Correct answer D. It activates the ring and directs to the 2- and 4-positions
Which alcohol gives a yellow precipitate of triiodomethane when warmed with iodine and aqueous NaOH?
Correct answer B. Propan-2-ol
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In the fermentation of glucose to ethanol by yeast, which enzyme complex converts glucose into ethanol and carbon dioxide?
Correct answer B. Zymase
What is the IUPAC name of the alcohol CH₃CH(OH)CH₂CH₃?
Correct answer B. Butan-2-ol
In a Williamson synthesis, sodium ethoxide reacts with iodomethane. Which ether is formed?
Correct answer D. Methoxyethane
Which product forms when excess ethanol is heated with concentrated H₂SO₄ at about 140 °C?
Correct answer D. Ethoxyethane
Ethanol heated with excess concentrated H₂SO₄ at about 170 °C mainly gives ____.
Correct answer A. Ethene
What is the organic product when propan-2-ol is heated with acidified potassium dichromate(VI)?
Correct answer C. Propanone
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Which alcohol produces turbidity with Lucas reagent almost immediately at room temperature?
Correct answer C. 2-Methylbutan-2-ol
Lucas reagent, used to distinguish primary, secondary and tertiary alcohols, consists of ____.
Correct answer C. Concentrated HCl with anhydrous ZnCl₂
Which of the following is a tertiary alcohol?
Correct answer B. 2-Methylpropan-2-ol