1.

When one mole of an organic compound X is reacted with an excess of PCl_(5) then two moles of hydrogen chloride are formed. Which of the following compounds could be X?

Answer»

`UNDERSET(OH)underset(|)CH_(2)-underset(OH)underset(|)CH_(2)`
`C_(6)H_(5)CH=O`
`underset(OH)underset(|)CH_(2)-COOH`

Solution :`underset(CH_(2)-OH)OVERSET(CH_(2)-OH)(|) overset(PCl_(5))to underset(CH_(2)-Cl)overset(CH_(2)-Cl)(|)+2HCl`
`underset(OH)overset(CH_(2)-COOH)(|) overset(PCl_(5))to underset(Cl)overset(CH_(2)-COCl)(|)+2HCl`


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