To determine the false statement regarding unsaturated fatty acids, let’s analyze each option:
- a) Unsaturated fatty acids usually have more than one double bond: This statement is generally false. While many unsaturated fatty acids do have multiple double bonds (these are known as polyunsaturated fatty acids), unsaturated fatty acids can also have just one double bond (which are called monounsaturated fatty acids). Therefore, this statement can vary based on the type of unsaturated fatty acid being referred to.
- b) An unsaturated fatty acid has one or more carbon-carbon double bonds in the chain: This statement is true. By definition, unsaturated fatty acids contain one or more double bonds between carbon atoms in their hydrocarbon chain.
- c) A double bond in: This statement seems incomplete, but if it were to suggest that a double bond is a characteristic of unsaturated fatty acids, it would be true.
From this analysis, the false statement is option a), as not all unsaturated fatty acids have more than one double bond; some only have one.