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Spoilage of oil can be detected by which fatty acid?

1. Oleic acid
2. Linoleic acid
3. Linolenic acid
4. Erucic acid

Correct answer: Linolenic acid

Solution

Linolenic acid has three double bonds, making it the most easily oxidized among the options. Because it is highly unsaturated, its presence is a good indicator of oil spoilage.

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