Chemistry - Halogen Derivative Question with Solution | TestHub

The given reaction is the conversion of an alcohol to an alkyl chloride.

When an alcohol reacts with phosphorus pentachloride (${\mathrm{PCl}}_5$), it forms an alkyl chloride, phosphoryl chloride (${\mathrm{POCl}}_3$), and hydrogen chloride ($\mathrm{HCl}$).

The balanced chemical equation is:
$\mathrm{R}-\mathrm{OH}+{\mathrm{PCl}}_5⟶\mathrm{R}-\mathrm{Cl}+{\mathrm{POCl}}_3+\mathrm{HCl}$

Comparing this with the given reaction, compound Q is ${\mathrm{PCl}}_5$.

For reference, the reaction with ${\mathrm{PCl}}_3$ yields ${\mathrm{H}}_3{\mathrm{PO}}_3$ as a byproduct, and the reaction with ${\mathrm{SOCl}}_2$ yields ${\mathrm{SO}}_2$ and $\mathrm{HCl}$.

Answer: ${\mathrm{PCl}}_5$