Which element from following combines with hydrogen to form compound having lowest acidic strength?

Which element from following combines with hydrogen to form compound having lowest acidic strength?
  1. Cl
  2. Br
  3. F
  4. I

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. Acidic strength order: $\mathrm{HF} < \mathrm{HCl} < \mathrm{HBr} < \mathrm{HI}$

Asked in: MHT CET 2021 (23 Sep Shift 1)

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