1.

Ethyl ester overset(CH_(2)MgBr)underset("Excess")toP. The product P will be

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SOLUTION :RECALL that , esters react with excess of Grignard reagents to from `3^(@)` alcohols having at least two identical ALKYL groups corresponding to grignard reagent.
`R-overset(O)overset(||)(C)-R' +R''MgXto R-overset(HO)overset(|)underset(R'')underset(|)(C)-R''`
Since here grignard reagents is `CH_(3)Mg Br`, the `3^(@)` alcohol should hagve at least two methyl groups. Thus, the choice with at least two methyl groups at the carbon linked with -OH GROUP will be the correct choice. Hence (A) is the correct choice.


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