Explain why trichloroethanoic acid, $$$\mathrm{CCl}_{3} \mathrm{COOH}$$$, is more acidic than ethanoic acid, $$$\mathrm{CH}_{3} \mathrm{COOH}$$$. ............................................................................................................................................... . ............................................................................................................................................... . .........................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_42 Year：2024 Question No：9(a)

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33.1.1.1 reaction of an alkylbenzene with hot alkaline KMnO4 and then dilute acid, exemplified by methylbenzene

33.1.2 describe the reaction of carboxylic acids with PCl 3 and heat, PCl 5, or SOCl 2 to form acyl chlorides

33.1.3.1 the oxidation of methanoic acid, HCOOH, with Fehling’s reagent or Tollens’ reagent or acidified KMnO4 or acidified K2Cr2O7 to carbon dioxide and water

33.1.3.2 the oxidation of ethanedioic acid, HOOCCOOH, with warm acidified KMnO4 to carbon dioxide

33.1.4 describe and explain the relative acidities of carboxylic acids, phenols and alcohols

33.1.5 describe and explain the relative acidities of chlorine-substituted carboxylic acids

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