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Explain any two methods of Preparation of aldehydes.

Explain any two methods of Preparation of aldehydes.

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A)

1. By oxidation of alcohols: Oxidation of primary alcohols in presence of oxidizing agent like $K_2 Cr_2 O_p / H_2 SO_4, KMnO_4 , CrO_3$ gives aldehydes

2.By dehydrogenation of alcohols: Vapours of primary alcohol when passed heated copper at 573 K forms aldehyde

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