The correct order of reducing nature is :

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${PH}_{3} < {NH}_{3} < {AsH}_{3} < {SbH}_{3}$

${NH}_{3} < {PH}_{3} < {AsH}_{3} < {SbH}_{3}$

${NH}_{3} > {PH}_{3} > {AsH}_{3} > {SbH}_{3}$

${NH}_{3} < {AsH}_{3} < {PH}_{3} < {SbH}_{3}$

answer is A.

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Detailed Solution

Atomic size of group-15 elements increases down the group. Bond strength of group-15 hydrides decreases down the group because of less effective overlapping between the bonded atoms. As the bond length of hydrides decreases down the group, the reducing nature of group-15 hydrides increases.

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