Which one of the following reagent(s) can be used to oxidise primary alcohols to aldehydes?

C r O_{3}

in anhydrous medium

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K M n O_{4}

in acidic medium

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Pyridium chlorochromate

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Heat in presence of

C u

573 K

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Solution

The correct option is D Heat in presence of $C u$ at $573 K$
$K M n O_{4}$ will oxidise primary alcohol to carboxylic acids. Remaining all the threee reagents can be used to oxide primary alcohols to aldehydes.
Reaction of primary alcohols with Cu at 573 K : Primary alcohols undergo dehydrogenation to form aldehydes.

Mild oxidation of a primary alcohol is done and it gives an aldehyde.
The reagents which can be used for this oxidation are pyridinium chlorochromate (PCC) and anhydrous $C r O_{3}$ . If we use anhydrous $C r O_{3}$ , the yield is poor, but if we use PCC, the yiels is better.
$C H_{3} - C H_{2} - C H_{2} - O H P C C / a n h y d r o u s C r O_{3} - ------------- \to C H_{3} - C H_{2} - C H O$

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