3 moles of ethanol reacts with one mole of phosphorus tribromide to form 3 moles of bromo-ethane and one…

3 moles of ethanol reacts with one mole of phosphorus tribromide to form 3 moles of bromo-ethane and one mole of $X$. Which of the following is $X$ ?
  1. $\mathrm{H}_3 \mathrm{PO}_4$
  2. $\mathrm{H}_3 \mathrm{PO}_2$
  3. $\mathrm{HPO}_3$
  4. $\mathrm{H}_3 \mathrm{PO}_3$

Solution

$\begin{array}{r}3 \mathrm{C}_2 \mathrm{H}_3 \mathrm{OH}+\mathrm{PBr}_3 \longrightarrow 3 \mathrm{C}_2 \mathrm{H}_3 \mathrm{Br}+\mathrm{H}_3 \mathrm{PO}_3 \\ (X)\end{array}$

Asked in: AP EAMCET 2001

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