Question 1

Which of the following best describes the process of reduction in organic chemistry?

Accepted Answer

Reduction involves increasing the hydrogen content or decreasing the oxygen content of an organic molecule.

Question 2

Which catalyst is typically used for the heterogeneous hydrogenation of alkenes?

Accepted Answer

Finely divided platinum, palladium, or nickel

Question 3

During the catalytic hydrogenation of an alkene, what type of addition occurs?

Accepted Answer

Syn addition

Question 4

Partial hydrogenation of vegetable oils can lead to the formation of which type of fats associated with increased cardiovascular risk?

Accepted Answer

Trans fats

Question 5

In the electrophilic addition to an alkene, which species acts as the nucleophile?

Accepted Answer

The alkene

Question 6

According to Markovnikov's Rule, when HBr is added to propene, which product is favored?

Accepted Answer

2-bromopropane

Question 7

What is the major product when HBr is added to propene in the presence of peroxides?

Accepted Answer

1-bromopropane

Question 8

Which statement best explains the theoretical basis for Markovnikov's Rule?

Accepted Answer

The product with the more stable carbocation intermediate predominates due to lower activation energy ($$\Delta G$$^{\ddagger}$$).

Question 9

Which of the following is true about the oxymercuration-demercuration reaction?

Accepted Answer

It produces the Markovnikov alcohol without carbocation rearrangement.

Question 10

In hydroboration-oxidation of an alkene, what is the regiochemistry of the alcohol product?

Accepted Answer

Anti-Markovnikov

Question 11

Which of the following best describes the addition of Br$$_2 to an $$alkene?

Accepted Answer

Formation of a bromonium ion intermediate followed by nucleophilic attack

Question 12

What is the stereochemical outcome of the addition of Br$$_2 to $$cyclohexene?

Accepted Answer

Anti addition, producing trans-1,2-dibromocyclohexane

Question 13

Which of the following is a consequence of carbocation rearrangement during addition reactions?

Accepted Answer

Formation of more stable, rearranged products such as those resulting from 1,2-hydride or methyl shifts

Question 14

Which of the following best describes the role of water in the acid-catalyzed hydration of alkenes?

Accepted Answer

Water acts as the nucleophile attacking the carbocation intermediate.

Question 15

Which of the following statements about syn and anti addition is correct?

Accepted Answer

Syn addition means that substituents add to the same face of the double bond.

Question 16

Which of the following reactions is an example of anti-Markovnikov addition?

Accepted Answer

Hydroboration-oxidation of an alkene

Question 17

What is the major product when 2-methylpropene reacts with HBr in the presence of peroxides?

Accepted Answer

1-bromo-2-methylpropane

Question 18

Which of the following best explains why oxymercuration-demercuration does not lead to carbocation rearrangement?

Accepted Answer

The reaction proceeds via a mercurinium ion intermediate, which prevents rearrangement.

Question 19

In the addition of HBr to 2-methyl-2-butene, a methyl shift occurs. What is the name of this type of rearrangement?

Accepted Answer

1,2-methyl shift

Question 20

Which of the following statements about the addition of halogens to alkenes is correct?

Accepted Answer

The reaction proceeds via a cyclic halonium ion intermediate.

Addition Reactions of Alkenes: Mechanisms, Outcomes, and Applications

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