Question

Which is a stronger reducing agent, SbH3 or BiH3, and why?♥♥♥

Answer 1

BiH3 is stronger reducing agent because of its large size and low bond dissociation enthalpy.

Answer 2

BiH3 is stronger reducing agent than SbH3.It can be explained on the basis of the atomic size.If we move from Sb to Bi, the principle quantum no increases and hence atomic size increases. For this reason Bi-H bond is much more weaker than Sb-H3. Hence BiH3 is more efficient to give reducing equivalent than another one.