The p-Block Elements

The p-Block Elements

Question

Arrange the following in the decreasing order of their reducing character:

HF, HCl, HBr, HI

Answer

Reducing character depends on the ease of release of H. Down the group, atomic size of halogen increases, bond length increases, bond strength decreases, thus it becomes easier to release H. So, the correct order of reducing character is:

HF<HCl<HBr<HI

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