Chemistry - Complete Pblock- Question with Solution | TestHub

Stability depends on bond strength Bond strength depends on bond length. Bond length depends on the size of halides. Bigger bond length easily cleavage of H$-X$bond and thus, the correct order is$\text{HF}>\text{HCl}>\text{HBr}>\text{HI}$
$\text{IV}<\text{II}<\text{III}<\text{I}$