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What is The oxidation of retinol produces:- and explain in detail?
Retinal (vitamin A aldehyde): 
This is an aldehyde form obtained by the oxidation of retinol. 
Retinal and retinol are interconvertible.
Key Concept:
Oxidation of retinol produces retinal
Oxidation of retinal produces retinoic acid.
Ref : Textbook of Biochemistry, Satyanarayana