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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3hx184

Which combinations give a secondary alcohol after hydrolysis with $H X_{3} O X^{+}$ ? (Use excess Grignard reagent where an ester is involved.)

A $CH X_{3} MgBr$ with ethanal
B $CH X_{3} MgBr$ with methanal
Cexcess $CH X_{3} MgBr$ with ethyl methanoate, $HCOOC X_{2} H X_{5}$
D $C X_{2} H X_{5} MgBr$ with propanone

Answer: A, C

Ethanal gives propan-2-ol; a methanoate ester adds two equivalents and gives the secondary alcohol

(CH X_{3}) X_{2} CH - OH

. Methanal gives a primary alcohol (ethanol) and a ketone gives a tertiary alcohol (2-methylbutan-2-ol).

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More questions on Organometallic reagents: Grignard and organolithium

Grignard reagents are normally prepared in NEET level
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