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How is phenol (carbolic acid) prepared from aniline (diazotization)?

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How is phenol (carbolic acid) prepared from aniline (diazotization)?

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How is carbolic acid prepared from amino benzene?

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Preparation of phenol from aniline (diazotization) : 

When aniline is treated with sodium nitrite and hydrochloric acid (NaNO + HCl) at low temperature (0°C – 5°C), benzene diazonium chloride is formed. This reaction is called diazotization. 

An aqueous solution of benzene diazonium chloride on warming with water or dil. H2SO4 gives phenol.

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