Quiz - Reactions of Alkenes | Reactions of Alkenes

1

Which of the following conditions results in Markovnikov addition of water to alkenes?

BH3 then H2O2 under basic conditions

Hydrogen halide in water

OsO4 in hydrogen sulfide

KMnO4 in water

The electrophilic addition of hydrogen halides follows the Markovnikov rule: formation of the most stable carbocation (most substituted carbocation)

2

Which of the following alkene reactions are syn addition?

Hydroboration - oxidation

Addition of H2

Dihydroxylation using OsO4 and H2S

All of the above

Syn addition is the addition of 2 substituents to the same side of a double bond or triple bond

3

Which of the following alkene reactions is an anti addition?

Hydroboration - oxidation

Addition of Br2

Addition of H2O in dilute acid

None of the above

Anti addition: addition reaction in which 2 substituents are added to opposite sides of a double bond or triple bond

4

What is the product of the addition of Br2 to (E)-but-2-ene?

A meso dibromide compound

A racemic mixture of dibromide compounds

A single enantiomer of an optically active dibromide compound

(E)-2,3-dibromobut-2-ene

Meso compounds are achiral compounds that has multiple chiral centers

5

What is the result of the reaction between cyclohexene and peroxybenzoic acid?

Formation of a meso epoxide

Formation of an equimolar mixture of enantiomeric epoxides

Oxidative cleavage of the ring

Formation of the same product as that of the reaction between cyclohexene and OsO4

6

What is the role of peroxide in the radical bromination of alkenes?

Nucleophile

Electrophile

Radical chain initiator

Solvent

Radical chain initiators: substances that can produce radical species under mild conditions and promote radical reactions