Esters undergo two nucleophilic additions of Grignard reagents because the first addition results in a ketone which is more reactive than the ester. This example is a fragment from a comprehensive multiple choice quiz on the reactions of alcohols with a 1.5-hour video solution.
You can access the quiz at:
https://www.chemistrysteps.com/courses/alcohols-naming-preparation-and-reactions/
More about the Grignard reaction can be found at:
https://www.chemistrysteps.com/grignard-reaction-in-preparing-alcohols/
The Chemistry Steps Study Guides are available at:
https://www.chemistrysteps.com/organic-chemistry-summary-sheet-study-guides/
