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Friedel Crafts Alkylation, Acylation

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Question

What happens when H₃PO₃ is heated?

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Solution

H₃PO₃,on heating, undergoes disproportionation reaction to form PH₃ and H₃PO₄. The oxidation numbers of P in H₃PO₃,PH₃, and H₃PO₄ are +3, −3, and +5 respectively. As the oxidation number of the same element is decreasing and increasing during a particular reaction, the reaction is a disproportionation reaction.

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