JEE Main Chemistry question
Identify the total number of reagents from the given list (conc. HNO₃, KMnO₄/OH⁻, PCC, Cu/573 K, PDC, MnO₂, K₂Cr₂O₇, ...) that will oxidise 1° alcohols exclusively to aldehydes.
Answer: 4
Solution
PCC and PDC are mild, anhydrous chromium(VI) reagents that stop oxidation cleanly at the aldehyde stage; Cu/573 K effects catalytic dehydrogenation of a 1° alcohol to the aldehyde (with loss of H₂, no over-oxidation possible); MnO₂ is counted here as the fourth aldehyde-selective reagent (note: MnO₂ is
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