Using any alkene and any other reagents, how would you prepare the following compounds?
f.

Show how each of the following compounds can be synthesized from an alkene:

b.

How does the first step in the reaction of propene with Br₂ differ from the first step in the reaction of propene with HBr?

To understand why Br⁻ adds to a carbon of the bromonium ion rather than to the positively charged ­bromine, draw the product that would be obtained if Br⁻ did add to bromine.

What is the product of the addition of I—Cl to 1-butene? (Hint: Chlorine is more electronegative than iodine [Table 1.3].)

The reaction of 2-ethyl-1-pentene with Br₂, with H₂ + Pd/C, or with R₂BH/THF followed by aqueous HO^- + H₂O₂ leads to a racemic mixture. Explain why a racemic mixture is obtained in each case.

Using a sample of trans-2-pentene, how could you prove that the addition of Br₂ forms a cyclic bromonium ion intermediate rather than a carbocation intermediate?

Draw the product or products that will be obtained from the reaction of cis-2-butene and trans-2-butene with each of the following reagents. If a product can exist as stereoisomers, show which stereoisomers are formed.

4. Br₂ in CH₂Cl₂