Alcohol, Phenol and EtherMedium
Question
The products A and B obtained in the following reactions, respectively, are
$$3ROH + {PCl}_{3} \rightarrow 3RCl + A$$
$$ROH + {PCl}_{5} \rightarrow RCl + HCl + B$$
Options
A.$H_{3}{PO}_{4}$ and ${POCl}_{3}$
B.$H_{3}{PO}_{3}$ and ${POCl}_{3}$
C.$\ {POCl}_{3}$ and $H_{3}{PO}_{3}$
D.$\ {POCl}_{3}$ and $H_{3}{PO}_{4}$
Solution
Sol. [Key Concept: Alcohols reacting with phosphorus chlorides]
The balanced reactions are
3ROH + PCl₃ → 3RCl + H₃PO₃ and
ROH + PCl₅ → RCl + HCl + POCl₃.
Therefore A is phosphorous acid, H₃PO₃, and B is phosphoryl chloride, POCl₃. Hence, option (2).
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