Q23 / 200 · AP EAMCET 2001 · Chemistry

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 $X$ ?

A
$\mathrm{H}_3 \mathrm{PO}_4$
B
$\mathrm{H}_3 \mathrm{PO}_2$
C
$\mathrm{HPO}_3$
Correct answer
D
$\mathrm{H}_3 \mathrm{PO}_3$

Solution

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

Hence, the correct answer is option: 'D'.

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