The correct choices are - long chain of carbon and hydrogen and carboxyl group as fatty acid have long chains of hydrocarbons with carboxyl group makes it acid.
A fatty acid is an aliphatic chain with carboxylic acid that can be either saturated or unsaturated. Fatty acids make the lipid membrane with glycerols. A fatty acid consists of
- A long chain of an even number of carbon atoms and hydrogen atoms along the length of the chain at the end of the chain
- A carboxyl group (―COOH) at the other end.
- The carboxyl group makes it an acid (carboxylic acid).
Thus, the correct among the given choices are - long chain of carbon and hydrogen, a carboxyl group.
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