Which of the following reactions give phosphine? (i) Reaction of calcium phosphide with water (ii) Heating…
Which of the following reactions give phosphine?
(i) Reaction of calcium phosphide with water
(ii) Heating white phosphorous with concentrated NaOH solution in inert atmosphere
(iii) Heating red phosphorous with alkali
(i), (ii) only
(i), (ii), (iii)
(ii), (iii) only
(i), (iii) only
Solution
(i), (ii)
(i) The reaction of calcium phosphide with water
$\mathrm{Ca}_3 \mathrm{P}_2+3 \mathrm{H}_2 \mathrm{O} \longrightarrow \underset{\text { Phosphine }}{2 \mathrm{PH}_3+3 \mathrm{CaO}}$
(ii) Heating white phosphorous with concentrated NaOH solution
$\mathrm{P}_4+3 \mathrm{NaOH}+\mathrm{H}_2 \mathrm{O} \longrightarrow \underset{\text { Phosphine }}{\mathrm{PH}_3}+\underset{\begin{array}{c}\text { sodium } \\ \text { hypophosphite }\end{array}}{3 \mathrm{NaH}_2 \mathrm{PO}_2}$
(iii) Red phosphorous does not react with Alkali.