What mass of ethanoyl chloride (M = 78.5 g/mol) is formed from 0.25 mol of ethanoic acid with excess SOCl₂?
Correct answer A. 19.6 g
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MDCAT ECAT Chemistry MCQs
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Take C = 12, H = 1, O = 16. What is the percentage by mass of oxygen in ethanoic acid, CH₃COOH?
Correct answer A. 53.3%
What is observed when ethanoic acid is added to aqueous sodium hydrogencarbonate?
Correct answer A. Effervescence of carbon dioxide
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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
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
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
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What is the correct order of reactivity of acid derivatives towards nucleophilic acyl substitution?
Correct answer C. Acyl chloride > anhydride > ester > amide
Take C = 12, H = 1, O = 16. What is the percentage by mass of carbon in propanone, CH₃COCH₃?
Correct answer A. 62.1%
Take molar volume = 22.4 dm³/mol. What volume of H₂ at STP is needed to reduce 11.6 g of propanone (M = 58 g/mol) completely to propan-2-ol?
Correct answer C. 4.48 dm³
Take C = 12, H = 1, I = 127. What mass of triiodomethane, CHI₃, can form from 0.10 mol of propanone in the iodoform reaction?
Correct answer D. 39.4 g
What is the IUPAC name of CH₃CH₂COOH?
Correct answer D. Propanoic acid
What is the IUPAC name of formic acid, HCOOH?
Correct answer A. Methanoic acid
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What is the IUPAC name of (CH₃)₂CHCOOH?
Correct answer B. 2-Methylpropanoic 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
Which carboxylic acid is formed by acid hydrolysis of propanenitrile, CH₃CH₂CN?
Correct answer D. Propanoic acid
Methylmagnesium bromide is treated with dry CO₂ and then dilute acid. Which product forms?
Correct answer A. Ethanoic acid
Which conditions convert ethanol into ethanoic acid?
Correct answer B. Heating under reflux with excess acidified K₂Cr₂O₇