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

I. CrO₃ in anhydrous medium.

II. KMnO₄ in an acidic medium. 

III. Pyridinium chlorochromate.

IV. Heat in the presence of Cu at 573K. 

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p>I. CrO₃ in anhydrous medium.&nbsp;</p><p>II. Pyridinium chlorochromate.&nbsp;</p><p>III.&nbsp; Heat in the presence of Cu at 573K.&nbsp;</p><p>KMnO₄ is a strong oxidising agent and oxidises the primary alcohol to ketone. Hence cannot be used as a reagent to oxidise primary alcohols to aldehydes.</p>

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