Edexcel IGCSE Chemistry 4.35C carboxylic acid formulae

Practise carboxylic-acid formula questions by drawing displayed formulae, naming acids and calculating chain information from Mr.

Exam points

Draw displayed formulae for unbranched carboxylic acids, showing the O-H bond.
Calculate a CH2 chain value from Mr by subtracting end groups and dividing by 14.
Use formula data to name methanoic or ethanoic acid and count atoms in a molecule.

[Maximum number: 2]

Some cars in Brazil use ethanol, $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ , as a fuel instead of petrol.
The ethanol is made by the fermentation of glucose which is obtained from sugar cane.
The sugar is extracted from the sugar cane and then dissolved in water to make a sugar solution.

When ethanol is heated with acidified potassium dichromate(VI), it is oxidised to ethanoic acid.

The structural formula of ethanoic acid is $\mathrm{CH}_{3} \mathrm{COOH}$

Draw the displayed formula of ethanoic acid.

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4.35C Carboxylic acid structures and names question 1