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  • Which of the following reagents can be used to oxidise primary alcohols to aldehydes? (i) CrO_{3} in an anhydrous medium. (ii) KMnO_{4} in acidic medium. (iii) Pyridinium chlorochromate. (iv) Heat in the presence of Cu at 573K

Which of the following reagents can be used to oxidise primary alcohols to aldehydes?

(i) CrO_{3} in anhydrous medium.

(ii) KMnO_{4} in acidic medium.

(iii) Pyridinium chlorochromate.

(iv) Heat in the presence of Cu at 573K

Answers (1)

The answer is the option (i), (iii), and (iv). The complete oxidation of primary alcohols results in the formation of carboxylic acid unless a mild oxidising agent is added to terminate the reaction at the aldehyde formation step.  The most common mild oxidising agent used is PCC (Pyridinium chlorochromate). Some other compounds used for this purpose are CrO_{3} in an anhydrous medium and Heat in the presence of Cu at 573K. So, the correct answers are an option (i), (iii), and (iv)

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