Question

The correct order of reactivity of hydrogen halides with ethyl alcohol is :

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

Answer 1

The correct option is D $HI>HBr>HCl>HF$

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 reactivity of hydrogen halide with ethyl alcohol will be in order $HI>HBr>HCl>HF$.