Exam 8: Reactions of Alkenes and Alkynes

Instructions: Consider the reaction sequence below to answer the following question. -Refer to instructions.Write the complete reaction mechanism for the first step of this reaction sequence.Show all electron flow with arrows and show all intermediate structures.

What type of reactive intermediate is formed in the reaction of an alkene with HBr to give a bromoalkane?

Instructions: Consider the reaction below to answer the following question(s). Alkenes may be hydrated by the hydroboration/oxidation procedure shown. Refer to instructions.The regiochemistry of hydroboration/oxidation of alkenes is:

What type of reaction mechanism accounts for the reaction of an alkyne with HBr to give an alkyl bromide?

What is the major organic product obtained from the following reaction?

Draw the structure of the polymer formed from the monomer given below,showing four repeating units.

Instructions: The reaction of 2-methylpropene with HBr in ether gives one of the two products below.Answer the following question(s)about this reaction. -Refer to instructions.Which product would have a lower energy transition state for the formation of the intermediate leading to it?

Instructions: Consider the reaction below to answer the following question(s). Alkenes may be hydrated by the hydroboration/oxidation procedure shown. Refer to instructions.The intermediate formed in the first step of this reaction is:

What type of reactive intermediate is involved in both of the following general reaction types?

The product(s)of the reaction when carried out in an organic solvent Would be:

Instructions: For each reaction below,suggest structures for alkenes that give the indicated reaction products.There may be more than one answer. -Suggest structure(s):

What is the major organic product obtained from the following reaction?

Which set of reagents is used for the Markovnikov addition of water to an alkene without rearrangement?

What type of reactive intermediate is formed in the reaction of an alkene with aqueous acid to give an alcohol?

How many isomeric products would be formed when the following compound undergoes dehydration?

Predict the product of the reaction below.Indicate regiochemistry and stereochemistry if relevant.(D₂ = deuterium)

Instructions: To answer the question(s)below,consider the following reaction: When cyclohexene reacts with chlorine in tetrachloromethane,the trans-dihalide is formed. -Refer to instructions.Write the complete,stepwise mechanism for this reaction.Show all intermediate structures and all electron flow using arrows.