C2H5OH→300°CCuCH3CHO.The above process is

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$C_{2} H_{5} OH \to_{300 ° C}^{Cu} {CH}_{3} CHO .$
The above process is

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Reduction

Oxidation

Dehydrogenation

Both 2 and 3

answer is D.

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Detailed Solution

Ethanol upon oxidation with Cu followed by heating at 300⁰C gives aldehyde with molecular C₂H₄O.
Copper at 300°C is the reagent for dehydrogenation. When vapors of primary or secondary alcohol is are passed over Cu at 300°C, result in the formation of aldehyde (with primary alcohol) and ketone (with secondary alcohol).
Tertiary alcohols are oxidized to alkenes ( called dehydration ) with Cu at 300°C.