The correct order comparing the acid strengths of $\mathrm{HF}, \mathrm{HCl}, \mathrm{HBr}$ and…

The correct order comparing the acid strengths of $\mathrm{HF}, \mathrm{HCl}, \mathrm{HBr}$ and $\mathrm{HI}$ ?
  1. $\mathrm{HF}>>\mathrm{HCl}>>\mathrm{HBr}>>\mathrm{HI}$
  2. $\mathrm{HF}< < \mathrm{HCl}< < \mathrm{HBr}< < \mathrm{HI}$
  3. $\mathrm{HF}>\mathrm{HCl}>>\mathrm{HBr}>>\mathrm{HI}$
  4. $\mathrm{HF}< < \mathrm{HCl}>>\mathrm{HBr}>>\mathrm{HI}$

Solution

Down the group the electronegativity decreases and the size increases. Thus, it becomes easy to lose $\mathrm{H}^{+}$ion. This causes the increase in acidic strength down the group. Thus, the correct order is $\mathrm{HF}< < \mathrm{HCI}< < \mathrm{HBr}< < \mathrm{HI}$.

Asked in: AP EAMCET 2020 (22 Sep Shift 2)

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