A transluscent white waxy solid (A) on heating in inert atmospher… - Vidyadip

Question

A transluscent white waxy solid (A) on heating in inert atmosphere is converted into its allotropic form ' B '. Allotrope ' A ', on reaction with very dilute aqueous solution of KOH liberates highly poisonous gas (C) having rotten fish smell. With excess of chlorine (C) forms (D) which hydrolyse to a compound 'E'. Identify A to E giving chemical equations.

✓

Answer

- 'A' is white phosphorus, 'B' is red phosphorus.
'C' is phosphine, ' D ' is $PCl _5$, E ' is $H _3 PO _4$
.$\text{PH}_3+5\text{Cl}_2\xrightarrow{\\ \ \ \ \ \ \ \ }\text{PCl}_5+5\text{HCl}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{'C'}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{'D'} $
$\text{P}_4+3\text{KOH}+3\text{H}_2\text{O}\xrightarrow{\text{Heat}}3\text{KH}_2\text{PO}_2+\text{PH}_3(\text{g})\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ (\text{White phosphorus})\ \ \ \ \ \ \ \text{'C'}$
$\text{PCl}_5(\text{s})+4\text{H}_2\text{O}(\text{l})+\text{H}_3\text{PO}_4+5\text{HCl}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{'D'}\ \ \ \ \ \ \ \ \ \ \ \text{'E'}$

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