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Q.

Phenol is a colourless liquid. On keeping for long time, it converts into brown colour due to

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a

air oxidation into o-benzoquinone

b

air oxidation into m-benzoquinone

c

air oxidation into quinol

d

air oxidation into p-benzoquinone

answer is A.

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Detailed Solution

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Oxidation of phenol with chromic acid produces a conjugated diketone known as benzoquinone. In the presence of air, phenols are slowly oxidized to dark coloured mixtures containing quinones.

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