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CAIE A-Level Chemistry AS 18.2.1 Preparation of Esters Questions

Practise CAIE 9701 esterification by combining acid and alcohol fragments, using concentrated sulfuric acid and heat, and naming the ester.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • combine the acid acyl portion and alcohol alkyl portion to construct the ester structure
  • use concentrated H2SO4 as catalyst and heat, forming water as the condensation coproduct
  • name the ester as alkyl alkanoate and work backwards from its structure to both reactants

CAIE A-Level Chemistry AS 18.2.1 Preparation of Esters Questions question 1

[Maximum number: 1]

Two compounds, X and Y, are mixed and a little concentrated H2SO4\mathrm{H}_{2} \mathrm{SO}_{4} is added.
Ester Z is found in the resulting mixture of products.

Figure for Question CAIE A-Level Chemistry AS 18.2.1 Preparation of Esters Questions question 1 — CAIE A-Level Chemistry AS

Which two compounds could be X and Y ?

X

Y

CH3CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}

CH(CO2H)3\mathrm{CH}\left(\mathrm{CO}_{2} \mathrm{H}\right)_{3}

CH3CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}

CH3CO2CH2CH(OH)CH2OCOCH2CH3\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{OCOCH}_{2} \mathrm{CH}_{3}

CH3CO2H\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}

CH3CH2CO2CH2CH(OH)CH2OH\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{CH}_{2} \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2} \mathrm{OH}

CH3CO2H\mathrm{CH}_{3} \mathrm{CO}_{2} \mathrm{H}

CH2(OH)CH(OH)CH2(OH)\mathrm{CH}_{2}(\mathrm{OH}) \mathrm{CH}(\mathrm{OH}) \mathrm{CH}_{2}(\mathrm{OH})

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