Question

The correct order of reactivity of addition of hydrogen halides with alkene is:

• A. HBr>HF>HCl>HI
• B. HCl>HBr>HI>HF
• C. HI>HBr>HCl>HF
• D. HF>HBr>HCl>HI

Answer 1

The correct option is C HI>HBr>HCl>HF

The stability of hydrogen halides decreases down the group due to decrease in bond (H−X) dissociation energy in the order HF>HCl>HBr>HI. So, the addition of hydrogen halide with alkene will be in order HI>HBr>HCl>HF.