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Organic Chemistry - Alkenes and Their Reactions Quiz

#1

Which of the following statements about alkenes is true?

They contain at least one double bond between carbon atoms.
Explanation

Alkenes have at least one double bond, distinguishing them from alkanes.

#2

What is the general formula for alkenes?

CnH2n
Explanation

The general formula for alkenes is CnH2n, indicating the presence of double bonds.

#3

Which reagent is commonly used to convert alkenes to alcohols?

H2SO4
Explanation

Alkenes can be converted to alcohols using sulfuric acid (H2SO4) as a reagent in hydration reactions.

#4

What is the product of the reaction between propene and HBr?

2-bromopropane
Explanation

The reaction between propene and HBr results in the formation of 2-bromopropane.

#5

What is the IUPAC name for the alkene with the molecular formula C4H8?

But-2-ene
Explanation

The IUPAC name for C4H8 is But-2-ene, indicating a butene with a double bond at the second carbon.

#6

Which of the following is NOT a method for the synthesis of alkenes?

Deamination of amines
Explanation

Deamination of amines is not a method for synthesizing alkenes; it involves amine functional groups.

#7

Which compound would be expected as the major product in the following reaction? CH3CH2CH=CH2 + HBr

2-bromobutane
Explanation

The major product of the reaction is 2-bromobutane, resulting from the addition of HBr to the alkene.

#8

Which of the following reactions does NOT typically involve alkenes?

Substitution
Explanation

Substitution reactions do not typically involve alkenes; they are more common in alkanes.

#9

What is the stereochemistry of the product formed when cis-2-butene undergoes catalytic hydrogenation?

Both a and b
Explanation

Catalytic hydrogenation of cis-2-butene can result in a mixture of stereoisomers due to the possibility of cis and trans configurations.

#10

Which of the following is NOT a characteristic of the E2 mechanism?

It proceeds via a carbocation intermediate
Explanation

The E2 mechanism does not involve a carbocation intermediate; it is a concerted process.

#11

In which of the following reactions does an alkene act as a nucleophile?

Nucleophilic addition
Explanation

Alkenes act as nucleophiles in nucleophilic addition reactions, where they add to electrophiles.

#12

What type of reaction is the ozonolysis of alkenes?

Cleavage
Explanation

Ozonolysis is a cleavage reaction of alkenes, breaking the double bond and forming smaller molecules.

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