Q43. White phosphorus on reacting with NaOH gives NaH2PO2 and PH3 as products. This is an example of.
(a) Dimerisation reaction
(b) Disproportionation reaction
(c) Condensation reaction
(d) Precipitat

Question

Q43. White phosphorus on reacting with NaOH gives NaH2PO2 and PH3 as products. This is an example of.
(a) Dimerisation reaction
(b) Disproportionation reaction
(c) Condensation reaction
(d) Precipitation reaction

FirstInTest · Accepted Answer

Correct answer: b. Here Phosphorus atom changes its ON from 0 to +1 in NaH2PO2 and 0 to -3 in PH3.P4 + 3NaOH + 3H2O → PH3 + 3 NaH2PO2Phosphorus (P4) is in 0 oxidation state. In PH3, P is -3. In NaH2PO2, H2PO2- (hypophosphite), P is +1.Since P is simultaneously oxidized (+1) and reduced (-3), it is a disproportionation reaction.

Practice More CUET UG Questions