1.

Ethyl esterunderset("excess")overset(CH_(3)MgBr)toP. The product P is

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Solution :Since ESTERS add two moles of the Grignard reagent to form `3^(@)` alcohols, therefore, two of the alkyl groups in `3^(@)` alcohols must be IDENTICAL. Since the Grignard reagent is `CH_(3)MGBR`, therefore, the product must contain at least two methyl groups. the only product which contains at least two (actually three) `CH_(3)` groups is option (a). thus


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