CHEM 238 Final Test Questions with 100%
Correct Answers
When camphor is reduced by sodium borohydride
a. borneol, the endo alcohol formed through the exo attack of hydride is the major
product.
b. isoborneol, the exo alcohol formed through the endo attack of hydride is the major
product.
c. borneol, the endo alcohol formed through the endo attack of hydride is the major
product.
d. borneol, the exo alcohol formed through the exo attack of hydride is the major
product.
e. equal amounts of borneol and isoborneol are obtained.
isoborneol, the exo alcohol formed through the endo attack of hydride is the major
product.
Which of the following substituents of an aromatic ring are electron-withdrawing?
camphor is reduced by sodium borohydride:
a. carbonyl
c. amino
b. nitro
,d. a and c
e. a and b
a and b
Why do we need to convert indigo to leucoindigo to dye a fiber?
a. To learn how to do a reduction
b. Leucoindigo is a better dye than indigo
c. Indigo cannot be oxidized
d. Indigo is not water-soluble
e. Leucoindigo will be more expansive than indigo
indigo is not water-soluble
What type of derivatives are prepared from ketones and aldehydes?
a. benzamides and benzenesulfonamides
b. methiodides and picrates
c. 3,5-dinitrobenzoates and phenylurethanes
d. semicarbazones and 2,4-dinitrophenylhydrazones
e. 2,4,6-trinitrotoluenes and benzoates
semicarbazones and 2,4-dinitrophenylhydrazones
Upon heating, aspartame rearranges to form a cyclic compound known as _____.
a. diketopiperazine c. monellin
b. cyclamate d. saccharin
diketopiperazine
, What is true of α-helix secondary structures?
a. Involve hydrogen-bonding interaction between amino acid groups that are 4 residues
apart on the same chain.
b. Two chains are oriented in different directions.
c. Rarely make up more than a small part of total protein structure.
d. Are irregular in shape.
e. Involve interactions between side chains of amino acid residues.
Involve hydrogen-bonding interaction between amino acid groups that are 4 residues
apart on the same chain.
Which of the following is false?
a. In thermodynamic control, the product ratio depends on the relative stability of the
products.
b. In kinetic control, the product ratio depends on the relative energies of the transition
states.
c. In some reactions, the less stable product is formed at a faster rate.
d. For most reactions, the kinetic product and the thermodynamic product are the
Correct Answers
When camphor is reduced by sodium borohydride
a. borneol, the endo alcohol formed through the exo attack of hydride is the major
product.
b. isoborneol, the exo alcohol formed through the endo attack of hydride is the major
product.
c. borneol, the endo alcohol formed through the endo attack of hydride is the major
product.
d. borneol, the exo alcohol formed through the exo attack of hydride is the major
product.
e. equal amounts of borneol and isoborneol are obtained.
isoborneol, the exo alcohol formed through the endo attack of hydride is the major
product.
Which of the following substituents of an aromatic ring are electron-withdrawing?
camphor is reduced by sodium borohydride:
a. carbonyl
c. amino
b. nitro
,d. a and c
e. a and b
a and b
Why do we need to convert indigo to leucoindigo to dye a fiber?
a. To learn how to do a reduction
b. Leucoindigo is a better dye than indigo
c. Indigo cannot be oxidized
d. Indigo is not water-soluble
e. Leucoindigo will be more expansive than indigo
indigo is not water-soluble
What type of derivatives are prepared from ketones and aldehydes?
a. benzamides and benzenesulfonamides
b. methiodides and picrates
c. 3,5-dinitrobenzoates and phenylurethanes
d. semicarbazones and 2,4-dinitrophenylhydrazones
e. 2,4,6-trinitrotoluenes and benzoates
semicarbazones and 2,4-dinitrophenylhydrazones
Upon heating, aspartame rearranges to form a cyclic compound known as _____.
a. diketopiperazine c. monellin
b. cyclamate d. saccharin
diketopiperazine
, What is true of α-helix secondary structures?
a. Involve hydrogen-bonding interaction between amino acid groups that are 4 residues
apart on the same chain.
b. Two chains are oriented in different directions.
c. Rarely make up more than a small part of total protein structure.
d. Are irregular in shape.
e. Involve interactions between side chains of amino acid residues.
Involve hydrogen-bonding interaction between amino acid groups that are 4 residues
apart on the same chain.
Which of the following is false?
a. In thermodynamic control, the product ratio depends on the relative stability of the
products.
b. In kinetic control, the product ratio depends on the relative energies of the transition
states.
c. In some reactions, the less stable product is formed at a faster rate.
d. For most reactions, the kinetic product and the thermodynamic product are the
