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Which reagent will transform p-methylbenzenediazonium chloride into p-cresol?

1. Cu powder
2. H2O
3. H3PO2
4. C6H5OH

Correct answer: H2O

Solution

Warming an arenediazonium salt with water (steam/dilute acid) replaces the -N2+ group by -OH. Thus p-methylbenzenediazonium chloride is hydrolysed to p-cresol (4-methylphenol).

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