Question:
Pyridinium chlorochromate is a complex of ...........
Pyridinium chlorochromate is a complex of ...........
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To remember the composition of PCC, just break down the name: "Pyridinium" comes from Pyridine + HCl, and "chlorochromate" comes from \( \text{CrO}_3 \) + HCl.
Updated On: Apr 20, 2026
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Solution and Explanation
Step 1: Understanding the Concept:
Pyridinium chlorochromate (PCC) is a common, mild oxidizing agent used extensively in organic chemistry to convert primary alcohols to aldehydes without over-oxidizing them to carboxylic acids.
Step 2: Key Formula or Approach:
The approach is to recall the preparation and chemical composition of the PCC reagent based on its name and standard textbook definitions.
Step 3: Detailed Explanation:
The name "Pyridinium chlorochromate" hints directly at its components.
It is synthesized by dissolving chromium trioxide (\( \text{CrO}_3 \)) in hydrochloric acid (\( \text{HCl} \)), and then adding pyridine (\( \text{C}_5\text{H}_5\text{N} \)).
The reaction forms a complex salt with the formula \( [\text{C}_5\text{H}_5\text{NH}]^+ [\text{CrO}_3\text{Cl}]^- \).
The components of this complex are therefore: Pyridine (\( \text{C}_5\text{H}_5\text{N} \)), Hydrogen chloride (\( \text{HCl} \)), and Chromium trioxide (\( \text{CrO}_3 \)).
Step 4: Final Answer:
It is a complex of Pyridine, \( \text{CrO}_3 \), and HCl.
Pyridinium chlorochromate (PCC) is a common, mild oxidizing agent used extensively in organic chemistry to convert primary alcohols to aldehydes without over-oxidizing them to carboxylic acids.
Step 2: Key Formula or Approach:
The approach is to recall the preparation and chemical composition of the PCC reagent based on its name and standard textbook definitions.
Step 3: Detailed Explanation:
The name "Pyridinium chlorochromate" hints directly at its components.
It is synthesized by dissolving chromium trioxide (\( \text{CrO}_3 \)) in hydrochloric acid (\( \text{HCl} \)), and then adding pyridine (\( \text{C}_5\text{H}_5\text{N} \)).
The reaction forms a complex salt with the formula \( [\text{C}_5\text{H}_5\text{NH}]^+ [\text{CrO}_3\text{Cl}]^- \).
The components of this complex are therefore: Pyridine (\( \text{C}_5\text{H}_5\text{N} \)), Hydrogen chloride (\( \text{HCl} \)), and Chromium trioxide (\( \text{CrO}_3 \)).
Step 4: Final Answer:
It is a complex of Pyridine, \( \text{CrO}_3 \), and HCl.
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