Answer
the correct answer is option (b)
Work Step by Step
Fatty acids are lipids having carboxylic acid group attached to a long hydrocarbon chain. If there are double bonds in the hydrocarbon chain of the fatty acid, then the fatty acid are said to be unsaturated. Unsaturated fatty acids are found in corn oil, sunflower oil. They are good for health. If there are no double bonds in the hydrocarbon chain, then the fatty acid is said to be saturated. Saturated fatty acids are available in milk products like butter. Saturated fatty acids are not good for health.
Step 2 of 3 All fatty acids contain hydrogen in the carboxylic acid group and the hydrocarbon chain. A fatty acid is not categorized as saturated as unsaturabed based on the presence or absence of hydrogens. Hence, option (a) is not correct. Fatty acids contain a polar head which is a carboxylic group. A long hydrocarbon tail is attached to this head. Since all fatty acids have a carboxylic group, it is not the basis for classification of saturated or unsaturated. Hence, option (c) is not correct. Fatty acids that are bound to a glycerol are called di or triacylglycerols. The term lipids most commonly refer to these triacylglycerols. Hence, option (d) is not correct.
Step 3 of 3 Carbons in the hydrocarbon chain of fatty acids are said to be saturated when all the valence positions are occupied. If the valence positions are not completely occupied, it results in either double bonds or triple bonds. Those fatty acid chains that have double bonds in them are said to be unsaturated. Hence, the correct answer is option (b).
