Multiple Choice Quiz

Multiple Choice Quiz

Multiple Choice Quiz

1

Which of the following is the most stable radical?

A)

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B)

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C)

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D)

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2

Rank the following alkyl radicals in order of increasing stability (least < < <most).

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A)

4 < 2 < 1 < 3

B)

3 < 1 < 2 < 4

C)

1 < 3 < 4 < 2

D)

2 < 4 < 3 < 1

3

What is the heat of reaction for the following reaction?
CH₃–CH₃ + I₂ → CH₃–CH₂I + HI
The bond dissociation energies in kJ/mol are:

CH₃CH₂–H 410

I–I 151

CH₃CH₂–I 224

H–I 297

A)

40 kJ/mol

B)

–40 kJ/mol

C)

186 kJ/mol

D)

–186 kJ/mol

4

Consider the following reaction whose energy of activation is 30 kJ/mole.

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Using the following homolytic bond dissociation energies: (CH₃)₂CH–H = 395 kJ/mole, CH₃CH₂–H = 410 kJ/mole, determine the energy of activation for the reverse reaction.

A)

45 kJ/mole

B)

15 kJ/mole

C)

30 kJ/mole

D)

–30 kJ/mole

5

What is the major product of the following reaction?

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A)

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B)

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C)

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D)

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6

What is the major product of the following reaction?

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A)

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B)

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C)

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D)

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7

Predict the major product of the following reaction:
2-methylbutane + Br₂/light energy →

A)

1-bromo-2-methylbutane

B)

2-bromo-2-methylbutane

C)

2-bromo-3-methylbutane

D)

1-bromo-3-methylbutane

8

Which of the following occurs during the initiation stage of a radical mechanism?

A)

Nonradicals are formed from radicals.

B)

Radicals are formed from other radicals.

C)

Radicals are formed from nonradicals.

D)

Nonradicals are formed from other nonradicals.

9

Which of the following alkanes will give more than one monochlorination product upon treatment with chlorine and light?

A)

2,2-dimethylpropane

B)

cyclopropane

C)

ethane

D)

2,3-dimethylbutane

10

Which of the following is the major product of the chlorination of methane if a large excess of chlorine is used?

A)

CH₃Cl

B)

CH₂Cl₂

C)

CH₃CH₂Cl

D)

CCl₄

11

Which of the following is the major product of the chlorination of methane if a large excess of methane is used?

A)

CH₃Cl

B)

CH₂Cl₂

C)

CH₃CH₂Cl

D)

CCl₄

12

Consider the reaction of 2-methylpropane with a halogen. With which halogen will the product be almost exclusively 2-halo-2-methylpropane?

A)

F₂

B)

Cl₂

C)

Br₂

D)

I₂

13

How many products (not counting enantiomers) would be expected from the monochlorination of 2,2-dimethylpentane in the presence of light?

A)

6

B)

5

C)

4

D)

3

14

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a

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b

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c

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d

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A)

a and c

B)

a and d

C)

b and c

D)

c and d

15

Which of the following elementary reactions corresponds to a propagation step in the formation of chloroethane from ethane and chlorine?

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A)

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B)

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C)

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D)

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16

Which of the following elementary reactions corresponds to an initiation step in the formation of chloroethane from ethane and chlorine?

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A)

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B)

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C)

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D)

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17

What is the product of the following reaction?

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A)

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B)

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C)

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D)

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18

Predict the product of the following reaction.
1-methylcyclohexene + HBr/H₂O₂ →

A)

1-bromo-1-methylcyclohexane

B)

1-bromo-2-methylcyclohexane

C)

1-hydroxy-1-methylcyclohexane

D)

1-hydroxy-2-methylcyclohexane

19

Which of the following is the MOST stable radical?

A)

a methyl radical

B)

a primary radical

C)

a secondary radical

D)

a tertiary radical

20

Identify the reagent(s) that will promote the following transformation.

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A)

HBr, tetrahydrofuran

B)

HBr, peroxides

C)

Br₂, CCl₄

D)

Br₂, H₂O

21

What is the structure of the monomer from which the following polymer was made?

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A)

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B)

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C)

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D)

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22

The following structure represents a subunit of a hydrocarbon polymer that may be prepared by a radical polymerization method. Identify the monomer that has been polymerized to make this polymer chain.

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A)

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B)

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C)

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D)

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23

Which version of the radical halogenation of an alkane is MOST selective?

A)

fluorination

B)

chlorination

C)

bromination

D)

iodination

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