Answer :

When acetone reacts with a Grignard reagent, a tertiary alcohol is formed. Let's break down this reaction to understand why.

  1. Grignard Reagents: These are organomagnesium compounds typically represented as R-MgX, where R is an alkyl or aryl group, and X is a halogen. Grignard reagents are highly reactive and act as nucleophiles.

  2. Acetone: Acetone is a simple ketone with the formula CH₃(CO)CH₃. In this reaction, it provides the carbonyl group (C=O) that the Grignard reagent will attack.

  3. Reaction Process:

  • The nucleophilic carbon in the Grignard reagent attacks the electrophilic carbon in the carbonyl group of acetone.
  • This step results in a tetrahedral alkoxide intermediate.
  • The intermediate is then protonated usually by adding a dilute acid like water or an alcohol, forming a tertiary alcohol.

  1. Product:

  • The product of this reaction is a tertiary alcohol. This is because the carbon carrying the OH group in the final alcohol structure is bonded to three other carbon atoms.

Therefore, the correct option for this reaction is a tertiary alcohol (3º alcohol).

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Rewritten by : Barada