Question

Why is BiH3 the strongest reducing agent among all the hydride of group 15elements?

Answer 1

Answer:

As we move down the group, the size of the element increases and, therefore, the bond length of the M—H bond increases and its strength decreases. ... Thus, BiH2 is least stable among the hydrides of group 15 and hence is the strongest reducing agent.

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Answer 2

Answer:

• As we move down a group, the atomic size increases and the stability of the hydrides of group 15 elements decreases.
• Since the stability of hydrides decreases on moving from NH3 to BiH3, the reducing character of the hydrides increases on moving from NH3 to BiH3.