Alkene Addition Reactions: Crash Course Organic Chemistry #16

What happens to piperine's E-double bonds when exposed to sunlight?

• They convert to cis-bonds, forming isomers with different heat properties.

• They break down completely, losing their spicy flavor.

• They form new E-double bonds, increasing the compound's stability.

• They undergo a polymerization reaction, creating larger molecules.

What is the general outcome of an alkene addition reaction?

• A pi bond breaks, and two new sigma bonds form across the double bond.

• Two pi bonds break, and one new sigma bond forms.

• A sigma bond breaks, and two new pi bonds form.

• The molecule undergoes rearrangement without changing its bonding type.

What is Markovnikov's rule in the context of alkene addition reactions?

• A proton adds to the carbon of the double bond that has the most hydrogens.

• A proton adds to the carbon of the double bond that has the fewest hydrogens.

• The added groups always attach to the same face of the double bond.

• The added groups always attach to opposite faces of the double bond.

When an asymmetrical alkene reacts with molecular chlorine in the presence of water, what type of mixture is typically formed due to the chloronium bridge?

• A racemic mixture.

• A pure enantiomer.

• A diastereomeric mixture.

• A single meso compound.

What is the expected stereochemistry of the added groups in halohydrin formation?

• Anti-addition

• Syn-addition

• Mixture of syn and anti

• No specific stereochemistry

What is the regioselectivity of acid-catalyzed hydration?

• Water adds to the more substituted carbon, with possible rearrangements.

• Water adds to the less substituted carbon, with possible rearrangements.

• Water adds to the more substituted carbon, without rearrangements.

• Water adds to the less substituted carbon, without rearrangements.

Which of the following is a characteristic of oxymercuration-reduction reactions?

• Carbocation rearrangements are blocked.

• Carbocation rearrangements are common.

• It results in anti-Markovnikov addition.

• It involves syn-addition of water.

What is the regioselectivity of hydroboration?

• Anti-Markovnikov addition of water.

• Markovnikov addition of water.

• Water adds to the more substituted carbon.

• Water adds to the carbon with more alkyl groups.