1.

Ethyl ester underset"excess"overset(CH_3MgBr)toP. The product P will be

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Solution :Recall that, esters react with EXCESS of Griguard reagents to FORM `3^@` alcohols having at least two IDENTICAL ALKYL groups corresponding to GRIGNARD reagent
`R-oversetOoverset"||"C-OR'+R''MgX -- to R-underset(R'')underset|overset(OH)overset|C-R''`
Since here Griguard reagent is `CH_3MgBr`, the `3^@` alcohol should have 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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