Arrange HBr,HI,HF,HCl in increasing order of acidic strengh.?

With increase in atomic size from F to I ,bond length of H----X
bond increases and so bond dissociation energy decreases.
Hence,ionisation of H---X increases,therefore acidic strength
increases in the order
HF < HCl < HBr < HI

HI (strongest), HBr, HCl, HF (weakest)

Acid strength depends on the readiness for it to dissociate in water.
Eqn: HX + H2O ---> X- + H3O+

They are all halogen halides (HX); hydrogen bonded to a halogen
As I is much bigger than F, the bond length of HI is longer than the bond length of HF. Thus, bond strength of HI is weaker and dissociates more readily.

with increase in atomic size from top to bottom the bond strenghth between H- ion and halogen decreases and with decrease of bond strength it is more easy to lose H-ion
hence the order is................HF<HCl<HBr<HI......
hope u got ur answer.............

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Arrange HBr,HI,HF,HCl in increasing order of acidic strengh.?

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HI<HBr<HCl<HF