Write preparation of phenol from aniline.

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Q. Write preparation of phenol from aniline.

Maharashtra MsbshseMaharashtra HSC (MSBSHSE) Board 2022Subjective· 2mImportance★★★★★

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Diazotisation of aniline followed by hydrolysis of the diazonium salt yields phenol.

Aniline is first converted to benzenediazonium chloride by treating it with a cold ( $0-5°C$ ) solution of sodium nitrite and dilute hydrochloric acid (diazotisation):

$C_6H_5NH_2 + NaNO_2 + 2HCl \xrightarrow{0-5°C} C_6H_5N_2^+Cl^- + NaCl + 2H_2O$ …

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Same / Similar Concept — real previous-year questions on the same or a closely similar concept, not this exact question.

CBSE 2025Set X11 markMCQ
$Q. Cumene hydroperoxide on hydrolysis with dilute acid gives ______.$
(a) alcohol and phenol
(b) only phenol
(c) phenol and acetone
(d) alcohol and acetone
›Reveal solutionSolution

Cumene hydroperoxide, on hydrolysis with dilute acid, cleaves to give phenol and acetone (the industrial "cumene process" for phenol).

In the industrial cumene process, cumene (isopropylbenzene) is air-oxidised to cumene hydroperoxide, $\text{C}_6\text{H}_5\text{C(CH}_3)_2\text{OOH}$ . Treatment with dilute acid then cleaves it: …
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CBSE 2023Set ANNUAL1 markMCQ
$Q. In reaction of manufacturation of phenol from cumene the by-product is$
(a) Tribromophenol
(b) Benzoquenone
(c) Picric acid
(d) Acetone
›Reveal solutionSolution

In the industrial cumene process, oxidation of cumene followed by acid hydrolysis of the hydroperoxide yields both phenol and acetone.

Cumene (isopropylbenzene) is air-oxidised to cumene hydroperoxide. Treating this hydroperoxide with dilute acid causes rearrangement and cleavage to give phenol as the main product, with acetone (propan-2-one …

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CBSE 2022Set ANNUAL1 markMCQ
$Q. Isopropylbenzene on air oxidation followed by decomposition by dilute acid gives _____.$
(a) $C_6H_5OH$
(b) $C_6H_5COOCH_3$
(c) $C_6H_5COOH$
(d) $C_6H_5CHO$
›Reveal solutionSolution

Air oxidation of cumene followed by acid cleavage is the industrial cumene process for making phenol.

Isopropylbenzene (cumene) is air-oxidised to cumene hydroperoxide, which on treatment with dilute acid undergoes rearrangement/cleavage to give phenol and acetone as a co-product: …

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Q.Write preparation of phenol from aniline.

Concept understanding — Preparation of Phenols

Q.Write preparation of phenol from aniline.

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