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When phenol reacts with which one of the following reagents, a conjugate diketone will be formed ?

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$Zn, Δ$

$conc. {HNO}_{3}$

${Na}_{2} {Cr}_{2} O_{7} + H_{2} {SO}_{4}$

${Na}_{2} {Cr}_{2} O_{7}$

answer is D.

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Detailed Solution

${Na}_{2} {Cr}_{2} O_{7}$ is benzoquinone a conjugated diketone. It is an oxidation reaction.

An aromatic organic compound is phenol. It is a volatile white crystalline substance. A hydroxy group is joined to a phenyl group to form the molecule. It is mildly acidic and should be handled carefully because it can result in chemical burns.

Hence, the correct option is:(D) ${Na}_{2} {Cr}_{2} O_{7} + H_{2} {SO}_{4}$ .

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