Question:
Which of the following oxoacid is formed when phosphoric acid is made to react with \(PCl_5\)?
Which of the following oxoacid is formed when phosphoric acid is made to react with \(PCl_5\)?
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Remember that \(PCl_5\) frequently acts as a dehydrating reagent and can convert phosphorus oxyacids into condensed phosphorus compounds.
Updated On: Jun 17, 2026
- \(H_4P_2O_6\)
- \(H_4P_2O_7\)
- \(H_4P_2O_5\)
- \(H_3PO_3\)
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The Correct Option is C
Solution and Explanation
Concept:
\(PCl_5\) acts as a powerful chlorinating and dehydrating reagent. When phosphoric acid is treated with \(PCl_5\), dehydration takes place and condensation of phosphoric acid molecules occurs, leading to the formation of pyrophosphorous acid.
Step 1: Understanding the role of \(PCl_5\) Phosphorus pentachloride removes oxygen-containing groups and promotes dehydration reactions.
Step 2: Formation of the oxoacid On reaction of phosphoric acid with \(PCl_5\), condensation occurs and the oxoacid formed is: \[ H_4P_2O_5 \] which is known as
pyrophosphorous acid.
Step 3: Selecting the correct option Among the given options, only \[ H_4P_2O_5 \] matches the product formed. \[ \boxed{H_4P_2O_5} \]
Step 1: Understanding the role of \(PCl_5\) Phosphorus pentachloride removes oxygen-containing groups and promotes dehydration reactions.
Step 2: Formation of the oxoacid On reaction of phosphoric acid with \(PCl_5\), condensation occurs and the oxoacid formed is: \[ H_4P_2O_5 \] which is known as
pyrophosphorous acid.
Step 3: Selecting the correct option Among the given options, only \[ H_4P_2O_5 \] matches the product formed. \[ \boxed{H_4P_2O_5} \]
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