What is the IUPAC name of the organic compound formed in the following chemical reaction?
Acetone \( \xrightarrow{\text{(i) } C_{2}H_{5}MgBr,\ \text{dry ether} \;\;\text{(ii) } H_{2}O,\ H^{+}} \) Product
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Count the total number of carbons: Acetone (3 carbons) + Ethyl (2 carbons) = 5 carbons in the product alcohol.
Ketone + Grignard \(\rightarrow\) Tertiary alcohol.
Only option (C) fits a 5-carbon tertiary alcohol structure.