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Chapter 15: Q. 15.25 (page 521)

Safflower oil is polyunsaturated, whereas olive oil is monounsaturated. Why would safflower oil have a lower melting point than olive oil?

Short Answer

Expert verified

Due to the presence of fatty acids with two or three double bonds in its structure, safflower oil has a lower melting point than olive oil; nevertheless, olive oil's structure contains an indicated amount of oleic acid, which is known to have a single double bond (monounsaturated).

Step by step solution

01

Introduction

  • Lipids are hydrophobic esters of intermediate to long-chain fatty acids.
  • Saturated and unsaturated fatty acids are the two forms of fatty acids.
  • Unsaturated fatty acids have a long chain of carboxylic acids with double or triple bonds in their structure.
  • The fatty acid chain is said to be saturated when it contains all of the single bonds in its structure.
02

Explanation for Saturated and Unsaturated fats

  • The fatty acid chains in saturated fats form a regular pattern, with many dispersive forces acting in between them.
  • So, even though they are weak intermolecular forces, they produce a strong bond when they are near together.
  • As a result, high temperatures are required to shatter them.
  • The bend generated by the double bond disrupts the symmetry of unsaturated fats and weakens the dispersion of forces between the carbon chains.
  • As a result, the chains are only loosely bound together, causing them to melt at lower temperatures.
03

Determine the safflower oil have a lower melting point than olive oil 

  • A rigorous 30鈭�bend in the structure of fatty acids is ensured by the presence of a "cis" double bond.
  • The melting point is lower as a result.
  • The melting point of safflower oil is lower than that of olive oil because both are polyunsaturated.

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Most popular questions from this chapter

Match the lipoprotein ( 1to 4) with its description (a to d).

1. chylomicrons

2. VLDL

3. LDL

4. HDL

a. has the greatest abundance of protein

b. "bad" cholesterol

c. carries triacylglycerols synthesized in the liver to the muscles

d. has the lowest density

How does the structure of a fatty acid with a cis double bond differ from the structure of a fatty acid with a trans double bond?

Compare the structures and functional groups of arachidonic acid and prostaglandin PGE1.

How do molecules of cholesterol affect the structure of cell membranes?

Draw the condensed structural formula for a mixed triacylglycerol that contains two palmitic acid molecules and one oleic acid molecule on the center carbon of glycerol.
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