how will you convert lenzaldehyde into phenol
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I don't think lenzaldehyde actually exists...... :(
If you meant 'benzaldehyde', then here is your answer...
Benzaldehyde is oxidised using alkaline KMnO₄ to benzoic acid.
Then use soda lime (NaOH + CaO) to make benzoic acid undergo decarboxylation to benzene.
Benzene is made to react with Cl₂ in presence of FeCl₃ to convert it into Chlorobenzene.
Chlorobenzene is reacted with NaOH at 623K,300 atm to convert it into Phenol (Dow's process)
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