Question

Acidic strength of $HOBr$ is than\as acidic strength of $HOI$.

• A. greater
• B. less
• C. similar

Answer 1

The correct option is A greater

Acidic strength $\propto stablityofanion$
1. HOBr has a greater extent of back bonding, as oxygen back bonds with Br, creating a partial positive change on oxygen. Hence it(oxygen) snatches away electrons of the acidic H, thus releasing the $H^{+}$ ion.
2. Charge density of $OB{r}^{-}$ is more dispersed than $O{I}^{-}$ thus $HOBr$ is more acidic than $HOI$.