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Description of compounds, saponification, fatty acids

Which of the following describes the compound below?
CH3(CH)7CH=CH(CH2)7COOH
a. triglyceride
b. micelle
c. unsaturated fatty acid
d. saturated fatty acid

Question 2
Saponification will result in what products?
a. 3 fatty acids + glycerol
b. sodium salts of 3 fatty acids + glycerol
c. cholesterol + 3 fatty acids
d. cholesterol + sodium salts of 3 fatty acids

Question 3
Which of the following statements correctly describe(s) the relationship between the structure of a fatty acid and its melting point?
a. Saturated fatty acids have melting points that increase gradually with molecular weight.
b. Presence of a trans double bond has greater effect on melting point than a cis double bond.
c. As the number of double bonds in a fatty acid increases, the melting point decreases.
d. A and C

Question 4
Which of the following terms best describes the interior of a soap micelle in water?
a. hydrophobic
b. hard
c. hydrophiic
d. saponified

Question 5
Which of the following correctly describe(s) glyceryl trimyristate?
a. an ester
b. a triglyceride
c. a fat
d. all of the above

Question 6
A lipid bilayer is composed of what class of molecules?
a. cholesterol esters
b.triglycerides
c.phospholipids
d. steroids

Question 7
Most of the principal sex hormones in humans are
a. terpenes
b. prostaglandins
c. phospholipids
d. steroids

Question 8
Which reagent would be used to distinguish CH3(CH2)10COOH from CH3(CH2)4CH=CH(CH2)4COOH?
a.NaOH/H2
b.Ag(NH3)2
c.Br2/CCl4
d. H2Cr2O7

Question 9
What structural features of phospholipids contribute to the formation of a lipid bilayer?
a. non-polar hydrophilic head
b. non-polar hydrophobic carbon tail
c.ionized carboxylate groups
d. carbon chain with multiple hydroxyl groups

Question 10
What is the product of complete hydrogenation of linolenic acid?
a. linoleic acid
b. palmitic acid
c. stearic acid
d. arachidonic acid

Solution Preview

Question 1
Which of the following describes CH3(CH)7CH=CH(CH2)7COOH?
This is a fatty acid, a long chain carboxylic acid. In addition, because there is a double bond it is an unsaturated fatty acid.

Question 2
Saponification will result in what products?
Saponification is the hydrolysis of an ester (in this case, a triacylglycerol) under basic (NaOH) conditions to form an alcohol and the salt of the acid. Therefore, it will produce sodium salts of three fatty acids and glycerol.

Question 3
Which of the following statements correctly describe(s) the relationship between the structure of a fatty acid and its melting point?
Melting ...

Solution Summary

Multiple choice questions about saponification, fatty acids, reagents, and descriptions of compounds.

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