Chapter 10

Which of the following alkenes are terminal alkenes?

• I and II

• I and IV

• II and III

• I and III

Which of the following alkenes are internal alkenes?

• I and II

• II and III

• II and IV

• I and III

Which of the statements about the properties of the carbon-carbon double bond is not true?

• Trans alkenes are generally more stable than cis alkenes.

• There is restricted rotation around the carbon-carbon double bond.

• Whenever the two groups on each end of a carbon-carbon double bond are the same, two diastereomers are possible.

• The stability of the carbon-carbon double bond increases as the number of substituent groups increases.

Calculate the degree of unsaturation for a molecule with molecular formula C6H11Cl.

• 1

• 3

• 2

• 0

Calculate the degree of unsaturation for a molecule with molecular formula C8H9N

• 2

• 5

• 4

• 3

Which of the following statements about alkenes is not true?

• They can exist as cis and trans isomers.

• They are less reactive than alkanes.

• The carbon of the C=C double bond is sp2 hybridized.

• The bond angle found around the C=C double bond is approximately 120 degrees.

What type of reactive intermediate is formed in the reaction of an alkene with Br2 and H2O to give a bromohydrin?

• Carbanion

• Carbocation

• Radical

• Cyclic bromonium ion

Which of the following statements about the stereochemistry of electrophilic addition of HX to alkenes is true?

• A) Hydrohalogenation occurs with syn and anti stereochemistry.

• B) Hydrohalogenation generally yield an unequal mixture of two enantiomers.

• C) Hydrohalogenation occurs with syn stereochemistry only.

• D) Hydrohalogenation occurs with anti stereochemistry only.

Which of the following statements about hydroboration/oxidation of alkenes is true?

• Oxidation occurs with retention of configuration.

• In hydroboration, the boron atom bonds to the more substituted carbon.

• 9-BBN does not undergo hydroboration in the same manner as BH3.

• Hydroboration occurs with anti addition.

Which of the following alkenes is an E alkene?

• I

• II

• III

• IV