TAMU CHEM 238 FINAL 2024
EXAM
ANSWER ALL QUESTIONS IN THIS SECTION
QUESTION 1
Nucleophilic addition of an alcohol to a carboxylic acid is enhanced by catalytic
amounts of:
a. mineral acid
b. H2O
c. triethyl amine
d. quaternary amine salts
e. NaHCO3 - ANSWERS-a
QUESTION 2
Which compound would fit the following data?
2,4‐DNPTest: positive
Tollens'Test: negative
IR: peak approximately 1710cm‐1
Schiff'sTest: negative
IodoformTest: positive - ANSWERS-d
END OF
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, TAMU CHEM 238 FINAL 2024
EXAM
QUESTION 3
Which is not true in using acid chloride with an alcohol in the synthesis of an
ester?
a. gives higher yield
b. does not require excess alcohol
c. byproduct HCl can be easily removed
d. room temperature reaction
e. uses acid as catalyst - ANSWERS-e
QUESTION 4
In an electrophilic aromatic substitution reaction, methyl benzoate is:
a. more reactive than benzene
b. less reactive than benzene
c. as reactive as benzene
d. inert
e. transformed into an alcohol - ANSWERS-b
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, TAMU CHEM 238 FINAL 2024
EXAM
QUESTION 5
A method to make a primary alcohol with a Grignard reagent (R‐MgX) is to react
the Grignard reagent with:
a. a symmetrical ketone R2CO
b. an aldehyde R‐CHO
c. an ester R‐CO2R'
d. formaldehyde H‐CHO
e. an unsymmetric ketone R‐CO‐R' - ANSWERS-d
QUESTION 6
Why do we need to reduce indigo into leucoindigo before dyeing a fabric?
a. Indigo is harmful to humans
b. Reduction makes the dye last for longer
c. The color of indigo is too strong
d. Oxidation makes the dye stick to the fiber
e. Indigo is insoluble - ANSWERS-e
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, TAMU CHEM 238 FINAL 2024
EXAM
QUESTION 7
Which of the following statement(s) is/are correct?
a. Thermodynamic control deals with product stabilities controlling the product
ratio.
b. Kinetic control deals with product stabilities controlling the product ratio.
c. Thermodynamic control deals with transition state energies controlling the
product
ratio.
d. Kinetic control deals with transition state energies controlling the product ratio.
e. a and d are correct - ANSWERS-e
QUESTION 8
Which of the following cannot be used to break amide bonds?
a. HCl
b. KOH
c. DCC
d. trpysin
END OF
PAGE 4
EXAM
ANSWER ALL QUESTIONS IN THIS SECTION
QUESTION 1
Nucleophilic addition of an alcohol to a carboxylic acid is enhanced by catalytic
amounts of:
a. mineral acid
b. H2O
c. triethyl amine
d. quaternary amine salts
e. NaHCO3 - ANSWERS-a
QUESTION 2
Which compound would fit the following data?
2,4‐DNPTest: positive
Tollens'Test: negative
IR: peak approximately 1710cm‐1
Schiff'sTest: negative
IodoformTest: positive - ANSWERS-d
END OF
PAGE 1
, TAMU CHEM 238 FINAL 2024
EXAM
QUESTION 3
Which is not true in using acid chloride with an alcohol in the synthesis of an
ester?
a. gives higher yield
b. does not require excess alcohol
c. byproduct HCl can be easily removed
d. room temperature reaction
e. uses acid as catalyst - ANSWERS-e
QUESTION 4
In an electrophilic aromatic substitution reaction, methyl benzoate is:
a. more reactive than benzene
b. less reactive than benzene
c. as reactive as benzene
d. inert
e. transformed into an alcohol - ANSWERS-b
END OF
PAGE 2
, TAMU CHEM 238 FINAL 2024
EXAM
QUESTION 5
A method to make a primary alcohol with a Grignard reagent (R‐MgX) is to react
the Grignard reagent with:
a. a symmetrical ketone R2CO
b. an aldehyde R‐CHO
c. an ester R‐CO2R'
d. formaldehyde H‐CHO
e. an unsymmetric ketone R‐CO‐R' - ANSWERS-d
QUESTION 6
Why do we need to reduce indigo into leucoindigo before dyeing a fabric?
a. Indigo is harmful to humans
b. Reduction makes the dye last for longer
c. The color of indigo is too strong
d. Oxidation makes the dye stick to the fiber
e. Indigo is insoluble - ANSWERS-e
END OF
PAGE 3
, TAMU CHEM 238 FINAL 2024
EXAM
QUESTION 7
Which of the following statement(s) is/are correct?
a. Thermodynamic control deals with product stabilities controlling the product
ratio.
b. Kinetic control deals with product stabilities controlling the product ratio.
c. Thermodynamic control deals with transition state energies controlling the
product
ratio.
d. Kinetic control deals with transition state energies controlling the product ratio.
e. a and d are correct - ANSWERS-e
QUESTION 8
Which of the following cannot be used to break amide bonds?
a. HCl
b. KOH
c. DCC
d. trpysin
END OF
PAGE 4
