Question

maximum Reducing character in 15th group element

Answer 1

All the elements of 15th form hydrides of the type MH3 where M = N, P, As, Mb or Bi like NH3 , PH3 etc.
The stability of hydrides decreases down the group from NH3 to BiH3 due to decrease in their bond dissociation enthalpy which result in the increases of reducing character. Reducing character is directly related to the ease of losing hydrogen. Hence, NH3 is a mild reducing agent and BiH3 is having the strongest reducing character amongst all hydrides of group 15.
The trend of group 15 hydride is on the basis of reducing character is as following:
BiH3 > SbH3 > AsH3 > PH3 > NH3
Stability decreases down the group because the bond dissociation energy decreases. Hence lose of hydrogen is easy and reducing nature increases down the group.
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Answer 2

Hydrides are the maximum reducing character in 15th group of element.