JEE Main Chemistry question

The correct order of reducing ability of hydrides of group V (15) elements is [BITSAT 2008, EAMCET 2008, AMU 2008]

(A)NH_3<PH_3<AsH_3<SbH_3<BiH_3Correct
(B)NH_3>PH_3>AsH_3>SbH_3>BiH_3
(C)NH_3<PH_3<AsH_3<SbH_3<BiH_3Correct
(D)SbH_3>BiH_3>AsH_3>NH_3>PH_3

Answer: (A),(C)

Solution

As the central-atom–hydrogen bond weakens down group 15 (bond enthalpy falls with increasing atomic size), the hydride becomes a progressively stronger reducing

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Question ID VK-145650