What are two types of constitutional (or structural) isomers?

1
What are two types of constitutional (or
structural) isomers?

1. positional and geometrical
2. functional group and geometrical
3. functional group and positional
4. geometrical and optical
5. positional and optical

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2
Which of the following compounds does not have a
constitutional isomer with a different functional
group?

1. propanone (acetone)
2. 3-pentanone
3. ethanol
4. dimethyl ether
5. ethanal (acetaldehyde)

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3
Which of the following is a chiral molecule?

1. CH3CBr2Cl
2. CBrCl2I
3. CH3CBrClI
4. (CH3)2CHCl
5. CH2BrI

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4
Cyclohexane can assume two different geometries,
but to do this the ring becomes nonplanar. What
are these two arrangements of cyclohexane called?

1. cis and trans
2. vic and gem
3. strained and unstrained
4. twist boat and chair
5. meta and para

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5
The pKbfor the formate ion (HCOO-) is 10.26. What
is Ka for formic acid (HCOOH) ?

1. 1.8 x 10-5
2. 3.6 x 10-4
3. 1.8 x 10-4
4. 1.8 x 10-3
5. 5.6 x 10-4

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6
When primary alcohols are oxidized to aldehydes,
the reaction mixture is heated to a temperature
slightly above the boiling point of the aldehyde
so that the aldehyde distills out as soon as it
is formed. Why must aldehydes be removed from the
reaction mixture as soon as they are formed?

1. The aldehydes might polymerize.
2. The aldehydes might be reduced back to the
   alcohol.
3. The aldehydes might oxidize to CO2 and H2O.
4. Aldehydes are easily oxidized to carboxylic
   acids.
5. Aldehydes readily react with unreacted alcohol.

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7
The reaction of 1-propanol with K2Cr2O7 in acidic
solution produces __________.

1. propyne
2. propene
3. propanal
4. propanone
5. cyclopropanone

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8
Which one of the following cannot be easily
oxidized to a carboxylic acid by an acidic
solution of K2Cr2O7?

1. methanol
2. ethanol
3. acetaldehyde
4. 2-butanol
5. propanal

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9
Which of the following is not an advantage for
the preparation of esters by the reaction of an
acyl halide and alcohol versus the preparation by
the reaction of an organic acid and alcohol?

1. Reactions between acids and alcohols are slow and
   require prolonged boiling.
2. Reactions between acyl halides and alcohols are
   rapid and require no catalyst.
3. Reactions between acids and alcohols require a
   strong inorganic acid catalyst.
4. Reactions between acids and alcohols establish an
   equilibrium with both reactants and products
   present.
5. Acyl halides are much cheaper than organic acids
   because they are readily

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10
A reaction in which a small molecule, such as H2O
or HCl, is eliminated and two larger molecules
are bonded together is called a(n) __________
reaction.

1. elimination
2. condensation
3. addition
4. hydration
5. oxidation

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11
Which of the following is not a component of
nucleic acids?

1. phosphate group
2. carbohydrate unit
3. amino acids
4. selected organic acid
5. none of these

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