Question

Draw the bridged bromonium ion that is formed as an intermediate during the bromination of this alkene. Include hydrogen atoms, nonbonding electrons, and formal charge(s) in your structure.

Answer 1

Concepts and reason

Alkenes involve in electrophilic addition relations. Where, alkene acts as nucleophile and electrophile attacks on, one of the carbon of a double bond. Draw the bromonium intermediate for the reaction between an alkene and bromine.

Fundamentals

Alkenes react with dibromineto form 1,2-dibromo substituted compound through formation of a bromonium intermediate.

The reaction is,

Stereochemistry to bromonium intermediate can be applied is as follows:

In (E)-but-2-ene, the groups away from the observer are shown with hashed bond, and groups towards the observer are shown with dashed bond.

Ans:

Thus, the bromonium ion intermediate is,