Strong reducing behaviour of \( \mathrm{H}_{3} \mathrm{PO}_{2} \) i...

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Strong reducing behaviour of \( \mathrm{H}_{3} \mathrm{PO}_{2} \) is due to
(i) Low oxidation state of phosphorus
\( \mathrm{P} \)
(ii) Presence of two \( -\mathrm{OH} \) groups and one \( \mathrm{P}-\mathrm{H} \) bond
W
(iii) Presence of one-OH group and two \( \mathrm{P}-\mathrm{H} \) bonds
(iv) High electron gain enthalpy of phosphorus
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