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(D) The reaction of a Grignard reagent $(C_2H_5MgBr)$ with a carbonyl compound $(A)$ followed by acid hydrolysis $(H_3O^{+})$ yields an alcohol.In the

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Butanone

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(D) The reaction of a Grignard reagent $(C_2H_5MgBr)$ with a carbonyl compound $(A)$ followed by acid hydrolysis $(H_3O^{+})$ yields an alcohol.In the final product,$3-	ext{methylpentan}-3-	ext{ol}$,the carbon atom bearing the hydroxyl group is bonded to two ethyl groups $(C_2H_5-)$ and one methyl group $(CH_3-)$.Since one ethyl group comes from the Grignard reagent $(C_2H_5MgBr)$,the carbonyl compound $(A)$ must provide the remaining part of the structure,which is a ketone with one methyl group and one ethyl group attached to the carbonyl carbon.Thus,the structure of $A$ is $CH_3-CO-CH_2-CH_3$,which is butanone.The reaction is:$CH_3-CO-CH_2-CH_3 + C_2H_5MgBr$ $ightarrow CH_3-C(OMgBr)(C_2H_5)-CH_2-CH_3$ $\xrightarrow{H_3O^{+}} CH_3-C(OH)(C_2H_5)-CH_2-CH_3$ (which is $3-	ext{methylpentan}-3-	ext{ol}$).

Identify compound $A$ from the following reaction:
$A + C_2H_5MgBr$ $\xrightarrow[ether]{dry} B$ $\xrightarrow{H_3O^{+}} 3-\text{methylpentan}-3-\text{ol}$

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Identify compound $A$ from the following reaction:$A + C_2H_5MgBr$ $\xrightarrow[ether]{dry} B$ $\xrightarrow{H_3O^{+}} 3-\text{methylpentan}-3-\text{ol}$