Chemistry 5070 · O Level · Alkenes

Alkenes — practice question

The diagram shows the structure of propenyl ethanoate.
(a)[1]

Use the structure to explain the reason propenyl ethanoate is unsaturated.

(b)[2]

Describe a chemical test that demonstrates propenyl ethanoate is unsaturated. State both the test and the observation.

(c(i))[1]

Propenyl ethanoate is made from a reaction between a carboxylic acid and an alcohol. Name the carboxylic acid that is used.

(c(ii))[2]

Concentrated sulfuric acid is used as the catalyst in the reaction. Describe how a catalyst increases the rate of a chemical reaction.

(d(i))[3]

In an experiment, 11.6 g of the alcohol is reacted with excess carboxylic acid. The experimental yield of propenyl ethanoate is 6.72 g. The relative formula mass of propenyl ethanoate is 100. Show that the maximum possible yield of propenyl ethanoate is 20.0 g.

(d(ii))[1]

Calculate the percentage yield obtained for propenyl ethanoate in this experiment.

Worked solution & mark scheme

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