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Question

Phosphine cannot be prepared by which of the following rreaction?

A

White P is heated with NaOH

B

Red P is heated with NaOH

C

is heated with water

D

Phosphorus trioxide is boiled with water

Medium

Solution

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Correct option is
B

Red P is heated with NaOH

Red phosphorous does not reacts with caustic alkalies (NaOH or KOH). Whereas white phosphorus reacts with caustic alkalies to produce phosphine.

Phosphine is also obtained when calcium phosphide is heated with water.

Phosphine is also obtained whn phosphorus trioxide is boiled with water.

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