Carboxylic acids and derivatives (A-level only)

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Question 7
Medium

This question is about esters including those used as biodiesel.

a.

An ester is formed by the reaction of ethanoic anhydride with propan-1-ol.

Complete the equation for this reaction. In your answer, show clearly the structure of the ester formed and write its IUPAC name.

Ethanoic anhydride+CH3CH2CH2OH→…\text{Ethanoic anhydride} + \text{CH}_3\text{CH}_2\text{CH}_2\text{OH} \rightarrow \dotsEthanoic anhydride+CH3​CH2​CH2​OH→…

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b.

In a reaction to form biodiesel, one mole of a vegetable oil (triglyceride) reacts with an excess of methanol to form two moles of a methyl ester with molecular formula C17H32O2\text{C}_{17}\text{H}_{32}\text{O}_2C17​H32​O2​ and one mole of a methyl ester with molecular formula C19H38O2\text{C}_{19}\text{H}_{38}\text{O}_2C19​H38​O2​.

Draw the structure of the vegetable oil showing clearly the ester links. You should represent the hydrocarbon chains in the form CxHy\text{C}_x\text{H}_yCx​Hy​ where xxx and yyy are the actual numbers of carbon and hydrogen atoms in each chain.

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c.

Write a balanced chemical equation for the complete combustion of the methyl ester C17H32O2\text{C}_{17}\text{H}_{32}\text{O}_2C17​H32​O2​.

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Carboxylic acids and derivatives (A-level only) Questions

  1. A Level
  2. /Chemistry
  3. /Carboxylic acids and derivatives (A-level only)