JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Alcohols Phenols and Ethers

Incorrect method of preparation for alcohols from the following is:

(A)Ozonolysis of alkene.✓ Correct
(B)Reaction of Ketone with RMgBr followed by hydrolysis.
(C)Hydroboration-oxidation of alkene.
(D)Reaction of alkyl halide with aqueous NaOH.

Answer: (A)

Solution

Ozonolysis of alkenes produces aldehydes, ketones, and carboxylic acids, not alcohols. The other methods are valid alcohol preparation routes: Grignard reagents with ketones give tertiary alcohols, hydroboration-oxidation gives anti-Markovnikov alcohols, and alkyl halides with aqueous NaOH undergo nucleophilic substitution to form alcohols.

JEE Main · 2023 · 10 Apr 2023 · Shift 2 · Single correct option

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