Question 1

Which of the following is an unsaturated fatty acid?

Accepted Answer

A)  arachidonic acid 
B)  palmitic acid 
C)  stearic acid 
D)  lauric acid 
A)  arachidonic acid 
B)  palmitic acid 
C)  stearic acid 
D)  lauric acid

Question 2

Which of the following compounds contain(s) a carboxylic acid functional group?

Accepted Answer

A)  A and B only 
B)  A and C only 
C)  C only 
D)  B only 
A)  A and B only 
B)  A and C only 
C)  C only 
D)  B only

Question 3

Which of the following is obtained by the decarboxylation of oxalosuccinic acid?

Accepted Answer

A)  α-ketoglutaric acid 
B)  β-ketoglutaric acid 
C)  succinic acid 
D)  none of these 
A)  α-ketoglutaric acid 
B)  β-ketoglutaric acid 
C)  succinic acid 
D)  none of these

Question 4

Which of the following acids is the least soluble in water?

Accepted Answer

A)  acetic acid 
B)  propionic acid 
C)  capric acid 
D)  butyric acid 
A)  acetic acid 
B)  propionic acid 
C)  capric acid 
D)  butyric acid

Question 5

Which of the following is required during the decarboxylation of α-ketoglutaric acid?

Accepted Answer

A)  Nothing special, α-ketoglutaric acid readily undergoes thermal decarboxylation. 
B)  NADH2 
C)  NADH 
D)  NAD+ 
A)  Nothing special, α-ketoglutaric acid readily undergoes thermal decarboxylation. 
B)  NADH2 
C)  NADH 
D)  NAD+

Question 6

Which of the following gives the correct order of health risk for the three types of fatty acids?

Accepted Answer

A)  trans > saturated > cis 
B)  trans > cis > saturated 
C)  cis > saturated > trans 
D)  cis > trans > saturated 
A)  trans > saturated > cis 
B)  trans > cis > saturated 
C)  cis > saturated > trans 
D)  cis > trans > saturated

Question 7

Identify the Henderson-Hasselbalch equation.

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 8

Identify the fatty acid denoted by 18:2.

Accepted Answer

A)  stearic acid 
B)  palmitoleic acid 
C)  linoleic acid 
D)  arachidonic acid 
A)  stearic acid 
B)  palmitoleic acid 
C)  linoleic acid 
D)  arachidonic acid

Question 9

Which of the following cations are present in hard water?

Accepted Answer

A)  Ca2+ ions 
B)  Fe3+ ions 
C)  Mg2+ ions 
D)  all of these 
A)  Ca2+ ions 
B)  Fe3+ ions 
C)  Mg2+ ions 
D)  all of these

Question 10

Which of the following is the correct statement about stearic acid and linoleic acid?

Accepted Answer

A)  They have same melting point of −5°C. 
B)  The melting point of stearic acid is lower than that of linoleic acid. 
C)  The melting point of stearic acid is higher than that of linoleic acid. 
D)  They have the same melting point of 70°C. 
A)  They have same melting point of −5°C. 
B)  The melting point of stearic acid is lower than that of linoleic acid. 
C)  The melting point of stearic acid is higher than that of linoleic acid. 
D)  They have the same melting point of 70°C.

Question 11

Given that the electron-withdrawing ability of a substituent falls off with the distance, rank order the following carboxylic acids from the strongest acid to the weakest acid.

Accepted Answer

A)  (i) > (ii) > (iii) 
B)  (iii) > (ii) > (i) 
C)  (ii) > (iii) > (i) 
D)  (ii) > (i) > (iii) 
A)  (i) > (ii) > (iii) 
B)  (iii) > (ii) > (i) 
C)  (ii) > (iii) > (i) 
D)  (ii) > (i) > (iii)

Question 12

How are fatty acids obtained from animal fats?

Accepted Answer

A)  by hydrolysis 
B)  by reduction 
C)  by oxidation 
D)  by substitution 
A)  by hydrolysis 
B)  by reduction 
C)  by oxidation 
D)  by substitution

Question 13

Which of the following is used by dentists to cauterize gums?

Accepted Answer

A)  acetic acid 
B)  chloroacetic acid 
C)  dichloroacetic acid 
D)  trichloroacetic acid 
A)  acetic acid 
B)  chloroacetic acid 
C)  dichloroacetic acid 
D)  trichloroacetic acid

Question 14

Identify the product of the acid-catalyzed reaction of succinic acid with an excess of ethanol.

Accepted Answer

A)  ethylbutanoate 
B)  2-ethylbutanol 
C)  diethylbutanedioate 
D)  2-ethylbutane 
A)  ethylbutanoate 
B)  2-ethylbutanol 
C)  diethylbutanedioate 
D)  2-ethylbutane

Question 15

Which of the following is used as a bleaching agent in detergent preparations?

Accepted Answer

A)  sodium alkylbenzenesulfonate 
B)  sodium silicate 
C)  sodium perborate tetrahydrate 
D)  none of these 
A)  sodium alkylbenzenesulfonate 
B)  sodium silicate 
C)  sodium perborate tetrahydrate 
D)  none of these

Question 16

Which of the following compounds has the highest boiling point?

Accepted Answer

A)  butanoic acid 
B)  1-proponol 
C)  acetic acid 
D)  propanal 
A)  butanoic acid 
B)  1-proponol 
C)  acetic acid 
D)  propanal

Question 17

How many carboxylic acids have the molecular formula C4H8O2?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 18

Which of the following is true of the melting points of unsaturated fatty acids?

Accepted Answer

A)  The lower the degree of unsaturation, the lower is the melting point. 
B)  The greater the degree of unsaturation, the lower is the melting point. 
C)  The greater the degree of unsaturation, the greater is the melting point. 
D)  The degree of unsaturation has no effect on the melting point. 
A)  The lower the degree of unsaturation, the lower is the melting point. 
B)  The greater the degree of unsaturation, the lower is the melting point. 
C)  The greater the degree of unsaturation, the greater is the melting point. 
D)  The degree of unsaturation has no effect on the melting point.

Question 19

Which of the following is a saturated fatty acid?

Accepted Answer

A)  arachidonic acid 
B)  oleic acid 
C)  palmitic acid 
D)  linoleic acid 
A)  arachidonic acid 
B)  oleic acid 
C)  palmitic acid 
D)  linoleic acid

Question 20

Which of the following is a β-ketoacid?

Accepted Answer

A)  formic acid 
B)  benzoic acid 
C)  2-oxopropanoic acid 
D)  3-oxobutanoic acid 
A)  formic acid 
B)  benzoic acid 
C)  2-oxopropanoic acid 
D)  3-oxobutanoic acid

Exam 17: Carboxylic Acids

Which of the following is an unsaturated fatty acid?

Which of the following compounds contain(s) a carboxylic acid functional group?

Which of the following is obtained by the decarboxylation of oxalosuccinic acid?

Which of the following acids is the least soluble in water?

Which of the following is required during the decarboxylation of α-ketoglutaric acid?

Which of the following gives the correct order of health risk for the three types of fatty acids?

Identify the Henderson-Hasselbalch equation.

Identify the fatty acid denoted by 18:2.

Which of the following cations are present in hard water?

Which of the following is the correct statement about stearic acid and linoleic acid?

Given that the electron-withdrawing ability of a substituent falls off with the distance, rank order the following carboxylic acids from the strongest acid to the weakest acid.

How are fatty acids obtained from animal fats?

Which of the following is used by dentists to cauterize gums?

Identify the product of the acid-catalyzed reaction of succinic acid with an excess of ethanol.

Which of the following is used as a bleaching agent in detergent preparations?

Which of the following compounds has the highest boiling point?

How many carboxylic acids have the molecular formula C4H8O2?

Which of the following is true of the melting points of unsaturated fatty acids?

Which of the following is a saturated fatty acid?

Which of the following is a β-ketoacid?

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How many carboxylic acids have the molecular formula C₄H₈O₂?