How will you prepare aldehydes from alcohols ? Write chemical equations.

Explanation

Aldehydes can be obtained from `1^(@)` alcohols by oxidation or dehydrogenations.
`RCH_(2)OH + [O] underset("Oxidation")overset(K_(2)Cr_(2)O_(7)//H^(+))rarr RCHO + H_(2)O`
To prevent further oxidation of aldehydes to carboxylic acids, these are distilled of as soon as formed. Alternatively pyradinium chlorochromate (PCC) can be used to get excellent yield of aldehyde. Dehydrogenation of `1^(@)` alcohol to aldehyde is done by copper at 573 K.
`RCH_(2)OH overset(Cu//573K)rarr RCHO + H_(2)`