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Erucic acid is a monounsaturated omega-9 fatty acid, denoted 22 : 1 ω-9. It is prevalent in rapeseed, wallflower seed, and mustard seed, making up 40 to 50 percent of their oils. Erucic acid is also known as cis-13-docosenoic acid and the trans isomer is known as brassidic acid.

1. Erucic acid is a saturated fatty acid.
2. Erucic acid is a polyunsaturated fatty acid.
3. Erucic acid is a trans fatty acid.
4. Erucic acid is a monounsaturated omega-9 fatty acid.

Correct answer: Erucic acid is a monounsaturated omega-9 fatty acid.

Solution

The notation 22:1 means 22 carbons with one double bond, so it is monounsaturated rather than saturated or polyunsaturated. The ω-9 label tells you the double bond is nine carbons from the omega end, matching the correct description.

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