Question:
Which of the following reagents limits the oxidation of \(\text{R-CH}_2\text{OH}\) up to R-CHO only?
Which of the following reagents limits the oxidation of \(\text{R-CH}_2\text{OH}\) up to R-CHO only?
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PCC is a mild oxidising agent used in non-aqueous medium.
Updated On: Oct 1, 2026
- PCC
- \(\text{CrO}_3\)
- \(\text{K}_2\text{Cr}_2\text{O}_7\) / dil. \(\text{H}_2\text{SO}_4\)
- \(\text{KMnO}_4\) (acidic)
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The Correct Option is A
Solution and Explanation
Step 1: Idea
Strong oxidising agents convert a primary alcohol to aldehyde and then to carboxylic acid. A mild reagent is needed to stop at the aldehyde.
Step 2: Reagent
PCC (pyridinium chlorochromate) in dichloromethane oxidises \(RCH_2OH\) to \(RCHO\) only.
\(CrO_3\), acidified \(K_2Cr_2O_7\) and acidic \(KMnO_4\) are strong and give \(RCOOH\).
Final Answer:
PCC stops at the aldehyde. \[ \boxed{\text{(A)}\ \text{PCC}} \]
Strong oxidising agents convert a primary alcohol to aldehyde and then to carboxylic acid. A mild reagent is needed to stop at the aldehyde.
Step 2: Reagent
PCC (pyridinium chlorochromate) in dichloromethane oxidises \(RCH_2OH\) to \(RCHO\) only.
\(CrO_3\), acidified \(K_2Cr_2O_7\) and acidic \(KMnO_4\) are strong and give \(RCOOH\).
Final Answer:
PCC stops at the aldehyde. \[ \boxed{\text{(A)}\ \text{PCC}} \]
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