CHEM 326 LAB FINAL EXAM UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Question:
Bromination: Which of the following words does not describe solid sodium
hydroxide pellets?
a) basic
b) caustic
c) deliquescent
d) hygroscopic
e) pyrophoric
Answer:
e) pyrophoric
Question:
Bromination: What is the limiting reactant?
Answer:
acetanilide
Question:
Bromination: In the bromination lab, 1)_____ is being used as an oxidizing
agent, and 2)_____ is being used as a reducing agent.
a) sodium thiosulfate
b) sodium hypochlorite
Answer:
1) sodium hypochlorite
2) sodium thiosulfate
Question:
Bromination: Rank the following compounds in order of reactivity to
electrophilic aromatic bromination (1 = most reactive, 3 = least):
a) 4-bromoacetanilide
b) acetanilide
c) aniline
Answer:
a) 3
b) 2
c) 1
Question:
Bromination: Which of the following accurately describes the hazards of
concentrated acetic acid, and appropriate safety measures?
a) Vinegar is aqueous acetic acid. The same precautions that are taken in a
kitchen (e.g. don't mix with baking soda) are sufficient.
b) Concentrated acetic acid is corrosive and can cause skin burns. Its fumes
are pungent and harmful if inhaled. It should be kept in a fume hood, and
suitable gloves and eye protection should be worn.
c) Concentrated acetic acid is corrosive and can cause burns. Its fumes are
, pungent and harmful if inhaled. It should be kept in a fume hood, and suitable
gloves and eye protection should be worn. It is also shock-sensitive and must
be used behind a blast shield.
Answer:
b) Concentrated acetic acid is corrosive and can cause skin burns. Its fumes
are pungent and harmful if inhaled. It should be kept in a fume hood, and suit-
able gloves and eye pro-tection should be worn.
Question:
Bromination: What is the oxidizing reagent used for the bromination of
acetanilide?
Answer:
sodium hypochlorite
Question:
Bromination: What is the reducing reagent used for the bromination of
acetanilide?
Answer:
sodium thiosulfate
Question:
Diels-Alder: The isolated product of the Diels-Alder re-action that you perform
is which isomer?
a) exo-
b) end-
Answer:
b) exo-
Question:
Diels-Alder: When a Diels-Alder reaction is capable of proceeding via either
exo- or endo- approach of the dienophile, which is typically preferred?
a) exo-
b) end-
Answer:
b) endo-
Question:
Diels-Alder: Which of the following will be the limiting reactant in your
reaction?
a) maleic anhydride
b) tetrahydrofuran
c) furan
Answer:
c) furan
Question:
Diels-Alder: Which of the following are flammable liquids:
a) maleic anhydride
b) tetrahydrofuran
c) furan
d) furan and tetrahydrofuran
QUESTIONS AND CORRECT ANSWERS
Question:
Bromination: Which of the following words does not describe solid sodium
hydroxide pellets?
a) basic
b) caustic
c) deliquescent
d) hygroscopic
e) pyrophoric
Answer:
e) pyrophoric
Question:
Bromination: What is the limiting reactant?
Answer:
acetanilide
Question:
Bromination: In the bromination lab, 1)_____ is being used as an oxidizing
agent, and 2)_____ is being used as a reducing agent.
a) sodium thiosulfate
b) sodium hypochlorite
Answer:
1) sodium hypochlorite
2) sodium thiosulfate
Question:
Bromination: Rank the following compounds in order of reactivity to
electrophilic aromatic bromination (1 = most reactive, 3 = least):
a) 4-bromoacetanilide
b) acetanilide
c) aniline
Answer:
a) 3
b) 2
c) 1
Question:
Bromination: Which of the following accurately describes the hazards of
concentrated acetic acid, and appropriate safety measures?
a) Vinegar is aqueous acetic acid. The same precautions that are taken in a
kitchen (e.g. don't mix with baking soda) are sufficient.
b) Concentrated acetic acid is corrosive and can cause skin burns. Its fumes
are pungent and harmful if inhaled. It should be kept in a fume hood, and
suitable gloves and eye protection should be worn.
c) Concentrated acetic acid is corrosive and can cause burns. Its fumes are
, pungent and harmful if inhaled. It should be kept in a fume hood, and suitable
gloves and eye protection should be worn. It is also shock-sensitive and must
be used behind a blast shield.
Answer:
b) Concentrated acetic acid is corrosive and can cause skin burns. Its fumes
are pungent and harmful if inhaled. It should be kept in a fume hood, and suit-
able gloves and eye pro-tection should be worn.
Question:
Bromination: What is the oxidizing reagent used for the bromination of
acetanilide?
Answer:
sodium hypochlorite
Question:
Bromination: What is the reducing reagent used for the bromination of
acetanilide?
Answer:
sodium thiosulfate
Question:
Diels-Alder: The isolated product of the Diels-Alder re-action that you perform
is which isomer?
a) exo-
b) end-
Answer:
b) exo-
Question:
Diels-Alder: When a Diels-Alder reaction is capable of proceeding via either
exo- or endo- approach of the dienophile, which is typically preferred?
a) exo-
b) end-
Answer:
b) endo-
Question:
Diels-Alder: Which of the following will be the limiting reactant in your
reaction?
a) maleic anhydride
b) tetrahydrofuran
c) furan
Answer:
c) furan
Question:
Diels-Alder: Which of the following are flammable liquids:
a) maleic anhydride
b) tetrahydrofuran
c) furan
d) furan and tetrahydrofuran
