Grignard Reaction

Correct Answer: C. 3

The Grignard Reaction is the addition of an organomagnesium halide (Grignard reagent) to a ketone or aldehyde, to form a tertiary or secondary alcohol, respectively. The reaction with formaldehyde leads to a primary alcohol. The product is a tertiary alcohol; it follows that the starting compound must be a ketone. One strategy is to identify the Grignard fragment in the final product, and work backwards to identify the fragment derived from the starting material.

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