An example of an addition reaction is the hydrohalogenation of alkenes. Alkyl halides are produced when alkenes are hydrohalogenated. For instance, 2-bromopentane is produced when HBr and 1-pentene react.
Step 1: A tertiary carbocation intermediate is generated when the alkene is protonated.
Step 2: Alkyl bromide is produced when the bromide nucleophile attacks the carbocation intermediate in a nucleophilic manner.
This response observes Markovnikov'v guideline.
The electrophilic addition of hydrohalic acids like hydrogen chloride or hydrogen bromide to alkenes to produce the corresponding haloalkanes is known as a hydrohalogenation reaction.
The H + particle is drawn to the π‐bond electrons of the alkene, which frames a π complex. The complex then breaks, forming a single bond between the hydrogen and one of the double-bonded carbons. A carbocation is formed when a carbon atom loses some of its share of the bond.
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