Chapter 19, Problem 27P

Interpretation Introduction

Interpretation:

The following fatty acids should be arranged in increasing melting point:

  ${\text{CH}}_{\text{3}}{{\text{(CH}}_{\text{2}}\text{)}}_{\text{16}}{\text{COOH, CH}}_{\text{3}}{{\text{(CH}}_{\text{2}}\text{)}}_{\text{7}}{\text{CH=CH(CH}}_{\text{2}}{\text{)}}_{\text{7}}{\text{COOH, CH}}_{\text{3}}{\text{(CH}\text{)}}_{\text{5}}{\text{CH=CH(CH}}_{\text{2}}{\text{)}}_{\text{7}}\text{COOH}$

Concept Introduction:

Fatty acids are long chain carboxylic acid which may or may not have unsaturation in the molecule. They react with glycerol to form triglyceride. The reaction is known as esterification as carboxylic acid group react with alcoholic group to form ester group.

Unsaturated fatty acids can be defined as the long chain fatty acids which have long hydrocarbon chain with −COOH group. In unsaturated fatty acids, the carbon chain must have at least one double bond.