#1
Which of the following statements about alkenes is true?
They contain at least one double bond between carbon atoms.
ExplanationAlkenes have at least one double bond, distinguishing them from alkanes.
#2
What is the general formula for alkenes?
CnH2n
ExplanationThe general formula for alkenes is CnH2n, indicating the presence of double bonds.
#3
Which reagent is commonly used to convert alkenes to alcohols?
H2SO4
ExplanationAlkenes 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
ExplanationThe 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
ExplanationThe 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
ExplanationDeamination 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
ExplanationThe 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
ExplanationSubstitution 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
ExplanationCatalytic 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
ExplanationThe 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
ExplanationAlkenes act as nucleophiles in nucleophilic addition reactions, where they add to electrophiles.
#12
What type of reaction is the ozonolysis of alkenes?
Cleavage
ExplanationOzonolysis is a cleavage reaction of alkenes, breaking the double bond and forming smaller molecules.