Chapter 15.2, Problem 15.4P

(a)

Interpretation Introduction

Interpretation:

The $\text{omega-}n$ designation for oleic acid has to be identified.

Concept Introduction:

Fatty acid is an important component of lipid that consists of a carboxyl group $\left(-\text{COOH}\right)$ with long straight chain of carbon and hydrogen atoms. Long straight-chain can be saturated as well as unsaturated.

Fatty acid consists of hydrophobic and hydrophilic parts. The nonpolar part of the chain that consists of carbon and hydrogen atoms and is water repellant called hydrophobic part and the polar part that is attracted to water is called hydrophilic part. The hydrophobic part is larger than that of hydrophilic part.

Fatty acids with unsaturation are classified as $\text{omega-}n$ acids; here $n$ is the carbon number from that beginning of double bond occurs in a carbon chain.

(b)

Interpretation Introduction

Interpretation:

The $\text{omega-}n$ designation for arachidonic has to be identified.

Concept Introduction:

Refer to part (a).