IB DP Chemistry: HL复习笔记10.2.6 Alkenes - Hydrohalogenation

• Alkenes will react readily with hydrogen halides such as HCl and HBr to produce halogenoalkanes
• This reaction is known as hydrohalogenation 
• It is also an electrophilic addition reaction that occurs quickly at room temperature

Hydrohalogenation reactions in alkenes

• All the hydrogen halides react in this way, but the fastest reaction occurs in the order HI > HBr > HCl due to the increasing bond strength of the hydrogen-halogen bond, so the weakest bond reacts most easily
• The mechanism of this reaction is part of Higher Level Chemistry and is covered in Section 20