Which of the following reagents can not 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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Pyridinium chlorochromate.

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Heat in the presence of

C u

K

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Solution

The correct option is C $K M n O_{4}$ in acidic medium.
Strong oxidising agents such as acidified $K M n O_{4}$ are used for getting carboxylic acid from alcohols directly. $C r O_{3}$ in anhydrous medium is used as the oxidising agent for the isolation of aldehydes. Another useful reagent is PCC (pyridinium chlorochromate) oxidises primary alcohol to aldehyde.
primary alcohol passed over $C u$ at $300^{\circ} C$ is dehydrogenated to aldehydes
$K M n O_{4}$ in acidic medium can not be used to oxidise primary alcohols to aldehydes.

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Similar questions

Which of the following reagents can be used to oxidise primary alcohols to aldehydes?
(a) $C r O_{3}$ in anhydrous medium
(b) $K M n O_{4}$ in acidic medium
(c) Pyridinium chlorochromate
(d) Heat in the presence of Cu at 573K

Q. Why is

H C l

not used to make the medium acidic in oxidation reactions of

K M n O_{4}

in acidic medium?

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