Question 1

Identify the correct structure of stearic acid.

Accepted Answer

A)  CH3-(CH2)4-COOH 
B)  CH3-(CH2)8-COOH 
C)  CH3-(CH2)10-COOH 
D)  CH3-(CH2)16-COOH 
A)  CH3-(CH2)4-COOH 
B)  CH3-(CH2)8-COOH 
C)  CH3-(CH2)10-COOH 
D)  CH3-(CH2)16-COOH

Question 2

Identify the product obtained by the decarboxylation of propanoic acid.

Accepted Answer

A)  ethanal 
B)  propanol 
C)  ethane 
D)  proponone 
A)  ethanal 
B)  propanol 
C)  ethane 
D)  proponone

Question 3

Which of the following compounds will have the lowest 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 4

Which of the following notations corresponds to the fatty acid with the highest melting point?

Accepted Answer

A)  18:0 
B)  18:1 
C)  18:2 
D)  18:3 
A)  18:0 
B)  18:1 
C)  18:2 
D)  18:3

Question 5

Which of the following is not a dicarboxylic acid?

Accepted Answer

A)  glutaric acid 
B)  oxalic acid 
C)  succinic acid 
D)  none of these 
A)  glutaric acid 
B)  oxalic acid 
C)  succinic acid 
D)  none of these

Question 6

Which of the following reagents is required in saponification?

Accepted Answer

A)  an oxidizing agent 
B)  a strong base 
C)  a reducing agent 
D)  a weak acid 
A)  an oxidizing agent 
B)  a strong base 
C)  a reducing agent 
D)  a weak acid

Question 7

Which of the following is true of the sources of fatty acids?

Accepted Answer

A)  Both animals and plants are rich in saturated fatty acids. 
B)  Both animals and plants are rich in unsaturated fatty acids. 
C)  Animals are rich in saturated fatty acids, and plants are rich in unsaturated fatty acids. 
D)  Plants are rich in saturated fatty acids, and animals are rich in unsaturated fatty acids. 
A)  Both animals and plants are rich in saturated fatty acids. 
B)  Both animals and plants are rich in unsaturated fatty acids. 
C)  Animals are rich in saturated fatty acids, and plants are rich in unsaturated fatty acids. 
D)  Plants are rich in saturated fatty acids, and animals are rich in unsaturated fatty acids.

Question 8

In which form will carboxylic acid, RCOOH, be present in an aqueous solution with pH of the solution equal to the pKa of the acid?

Accepted Answer

A)  primarily as RCOOH(aq) 
B)  primarily as RCOO− (aq) 
C)  equal amounts of RCOOH(aq) and RCOO− (aq) 
D)  neither RCOOH(aq) nor RCOO− (aq) 
A)  primarily as RCOOH(aq) 
B)  primarily as RCOO− (aq) 
C)  equal amounts of RCOOH(aq) and RCOO− (aq) 
D)  neither RCOOH(aq) nor RCOO− (aq)

Question 9

Identify the group that replaces -OH in R-COOH when a carboxylic acid undergoes an esterification reaction.

Accepted Answer

A)  -R 
B)  -OR 
C)  -SH 
D)  -ONa 
A)  -R 
B)  -OR 
C)  -SH 
D)  -ONa

Question 10

Which of the following notations corresponds to the fatty acid with the lowest melting point?

Accepted Answer

A)  18:0 
B)  18:1 
C)  18:2 
D)  18:3 
A)  18:0 
B)  18:1 
C)  18:2 
D)  18:3

Question 11

What is the IUPAC name of the following compound?

Accepted Answer

A)  3-carboxyaniline 
B)  4-aminobenzoic acid 
C)  4-carboxyaniline 
D)  m-aminobenzoic acid 
A)  3-carboxyaniline 
B)  4-aminobenzoic acid 
C)  4-carboxyaniline 
D)  m-aminobenzoic acid

Question 12

Identify the correct order of pKa among the following acids: trichloroacetic acid, chloroacetic acid, and acetic acid.

Accepted Answer

A)  pKa of acetic acid > pKa of trichloroacetic acid > pKa of chloroacetic acid 
B)  pKa of trichloroacetic acid > pKa of chloroacetic acid > pKa of acetic acid 
C)  pKa of chloroacetic acid > pKa of acetic acid > pKa of trichloroacetic acid 
D)  pKa of acetic acid > pKa of chloroacetic acid > pKa of trichloroacetic acid 
A)  pKa of acetic acid > pKa of trichloroacetic acid > pKa of chloroacetic acid 
B)  pKa of trichloroacetic acid > pKa of chloroacetic acid > pKa of acetic acid 
C)  pKa of chloroacetic acid > pKa of acetic acid > pKa of trichloroacetic acid 
D)  pKa of acetic acid > pKa of chloroacetic acid > pKa of trichloroacetic acid

Question 13

Which of the following is true of the most abundant, naturally occurring fatty acids?

Accepted Answer

A)  Nearly all of them contain an even number of carbon atoms. 
B)  About 70% of them contain an odd number of carbon atoms. 
C)  Approximately half of them contain an even number of carbon atoms. 
D)  Nearly all of them contain an odd number of carbon atoms. 
A)  Nearly all of them contain an even number of carbon atoms. 
B)  About 70% of them contain an odd number of carbon atoms. 
C)  Approximately half of them contain an even number of carbon atoms. 
D)  Nearly all of them contain an odd number of carbon atoms.

Question 14

Identify the product formed by the decarboxylation of 3-oxobutanoic acid upon mild heating.

Accepted Answer

A)  propane 
B)  butane 
C)  acetone 
D)  propanone 
A)  propane 
B)  butane 
C)  acetone 
D)  propanone

Question 15

What product is formed when a carboxylic acid reacts with an alcohol in the presence of an acid catalyst?

Accepted Answer

A)  an ether 
B)  an ester 
C)  either an ether or an ester 
D)  neither an ether nor an ester 
A)  an ether 
B)  an ester 
C)  either an ether or an ester 
D)  neither an ether nor an ester

Question 16

In the decarboxylation of 3-oxobutanoic acid, what is the next step after a carbon dioxide molecule has been lost?

Accepted Answer

A)  keto-enol tautomerism to produce a stable enol form of the product 
B)  keto-enol tautomerism to produce a stable keto form of the product 
C)  the loss of carbon dioxide directly generates the final enol product 
D)  the loss of carbon dioxide directly generates the final keto product 
A)  keto-enol tautomerism to produce a stable enol form of the product 
B)  keto-enol tautomerism to produce a stable keto form of the product 
C)  the loss of carbon dioxide directly generates the final enol product 
D)  the loss of carbon dioxide directly generates the final keto product

Question 17

Saponification is an example of which type of reaction?

Accepted Answer

A)  esterification 
B)  ester hydrolysis 
C)  reduction 
D)  oxidation 
A)  esterification 
B)  ester hydrolysis 
C)  reduction 
D)  oxidation

Question 18

What is the product obtained when a carboxylic acid is reduced?

Accepted Answer

A)  an alkene 
B)  a primary alcohol 
C)  a secondary alcohol 
D)  a ketone 
A)  an alkene 
B)  a primary alcohol 
C)  a secondary alcohol 
D)  a ketone

Question 19

Which of the following is the correct structure of caproic acid?

Accepted Answer

A)  CH3(CH2)2COOH 
B)  CH3(CH2)3COOH 
C)  CH3(CH2)4COOH 
D)  CH3(CH2)10COOH 
A)  CH3(CH2)2COOH 
B)  CH3(CH2)3COOH 
C)  CH3(CH2)4COOH 
D)  CH3(CH2)10COOH

Question 20

Examine the following figure.   What does the image represent?

Accepted Answer

A)  a soap molecule 
B)  a detergent molecule 
C)  either a soap molecule or a detergent molecule 
D)  neither a soap molecule nor a detergent molecule 
A)  a soap molecule 
B)  a detergent molecule 
C)  either a soap molecule or a detergent molecule 
D)  neither a soap molecule nor a detergent molecule

Exam 17: Carboxylic Acids

Identify the correct structure of stearic acid.

Identify the product obtained by the decarboxylation of propanoic acid.

Which of the following compounds will have the lowest boiling point?

Which of the following notations corresponds to the fatty acid with the highest melting point?

Which of the following is not a dicarboxylic acid?

Which of the following reagents is required in saponification?

Which of the following is true of the sources of fatty acids?

In which form will carboxylic acid, RCOOH, be present in an aqueous solution with pH of the solution equal to the pKa of the acid?

Identify the group that replaces -OH in R-COOH when a carboxylic acid undergoes an esterification reaction.

Which of the following notations corresponds to the fatty acid with the lowest melting point?

What is the IUPAC name of the following compound?

Identify the correct order of pKa among the following acids: trichloroacetic acid, chloroacetic acid, and acetic acid.

Which of the following is true of the most abundant, naturally occurring fatty acids?

Identify the product formed by the decarboxylation of 3-oxobutanoic acid upon mild heating.

What product is formed when a carboxylic acid reacts with an alcohol in the presence of an acid catalyst?

In the decarboxylation of 3-oxobutanoic acid, what is the next step after a carbon dioxide molecule has been lost?

Saponification is an example of which type of reaction?

What is the product obtained when a carboxylic acid is reduced?

Which of the following is the correct structure of caproic acid?

Examine the following figure. What does the image represent?

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Identify the correct order of pK_a among the following acids: trichloroacetic acid, chloroacetic acid, and acetic acid.