Arrange the hydrides of group 15 in correct decreasing order of reducing nature.

Step-by-step solution

The reducing nature of the hydrides of group 15 elements depends on the stability of the M-H bond. As we move down the group from N to Bi, the atomic size of the central atom increases, which leads to a decrease in the bond dissociation enthalpy of the M-H bond. The bond strength decreases in the order NH ₃ > PH ₃ > AsH ₃ > SbH ₃ > BiH ₃ . Since the reducing character is directly proportional to the ease of releasing hydrogen atoms, the reducing nature increases as the bond strength decreases. Therefore, the correc