Which of these reacts with aqueous sodium hydroxide to form a salt?
Correct answer A. Phenol
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MDCAT ECAT Chemistry MCQs
Page 3 of MDCAT ECAT Chemistry multiple-choice questions with answers. Tap an option to check yourself.
Page 3 of 39
- 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
What volume of hydrogen at STP is evolved when 4.6 g of ethanol reacts with excess sodium (C = 12, H = 1, O = 16)?
Correct answer D. 1.12 dm³
6.0 g of ethanoic acid reacts with excess ethanol and gives 5.28 g of ethyl ethanoate. What is the percentage yield (CH₃COOH = 60, CH₃COOC₂H₅ = 88)?
Correct answer A. 60%
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Ethanol has a much higher boiling point than dimethyl ether of the same molar mass mainly because of ____.
Correct answer C. hydrogen bonding between ethanol molecules
What is the IUPAC name of CH₃COCH₃?
Correct answer A. Propanone
What is the hybridisation of the carbonyl carbon in aldehydes and ketones?
Correct answer C. sp²
Oxidation of a secondary alcohol with acidified potassium dichromate gives ____.
Correct answer A. a ketone
Aldehydes are generally more reactive than ketones towards nucleophilic addition because ____.
Correct answer D. they have less steric hindrance and fewer electron-releasing alkyl groups
Ethanal reacts with HCN in the presence of a base to form ____.
Correct answer A. 2-hydroxypropanenitrile
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In acid-catalysed nucleophilic addition to a carbonyl group, the acid acts by ____.
Correct answer A. protonating the carbonyl oxygen to make the carbon more electrophilic
Reduction of propanone with NaBH₄ gives ____.
Correct answer B. propan-2-ol
Which compound gives a silver mirror with Tollens’ reagent?
Correct answer B. Ethanal
Which of these aldehydes cannot undergo aldol condensation?
Correct answer C. Methanal
Aldehydes and ketones react with 2,4-dinitrophenylhydrazine to give ____.
Correct answer D. a yellow-orange precipitate
What mass of copper(I) oxide forms when 0.05 mol of propanal reacts completely with Fehling’s solution (Cu = 63.5, O = 16)?
Correct answer C. 7.15 g
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What is the approximate percentage by mass of oxygen in methanal, HCHO (C = 12, H = 1, O = 16)?
Correct answer C. 53.3%
Hydrolysis of ethanenitrile (CH₃CN) by boiling with dilute acid gives ____.
Correct answer D. ethanoic acid
Diethyl ether and methyl propyl ether show which type of isomerism?
Correct answer A. Metamerism
Which of these compounds can show geometric (cis-trans) isomerism?
Correct answer C. But-2-ene
Which of these alcohols is optically active?
Correct answer A. Butan-2-ol