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Which of the following pairings is correct?

1. Anionic detergent: glyceryl ester of stearic acid
2. Fat: sodium stearate
3. Soap: sodium salt of oleic acid
4. Soap: sodium lauryl sulphate

Correct answer: Soap: sodium salt of oleic acid

Solution

Soaps are sodium/potassium salts of long-chain fatty acids; oleic acid is such a fatty acid, so sodium oleate is a soap. Sodium lauryl sulphate is an anionic synthetic detergent, sodium stearate is a soap (not a fat), and a glyceryl ester of stearic acid is a fat (not a detergent).

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