See image — Reaction Mechanism Chemistry Question

💡 Solution & Explanation

Step 1 - Identify all electrophilic/reactive sites in the molecule that can react with a Grignard reagent (RMgX). The molecule contains the following functional groups: 1. A ketone (C=O on the cyclohexane ring) 2. An ester group (-COOEt, ethyl ester) 3. A nitrile group (-C≡N) 4. An alkyl chloride (-CH(Cl)-CH3, secondary alkyl chloride) 5. An acetate ester (-OC(=O)CH3, the acetoxymethyl group) Step 2 - Determine how many equivalents of RMgX each functional group consumes. Functional group reactions with Grignard reagents: a) Ketone: A Grignard reagent adds once to a ketone to give (after workup) a tertiary alcohol. This consumes 1 equivalent of RMgX. b) Ester (-COOEt): A Grignard reagent adds to an ester twice overall. The first addition gives a ketone intermediate (after loss of ethoxide), and the second addition of RMgX to that ketone gives a tertiary alcohol. This consumes 2 equivalents of RMgX. c) Nitrile (-C≡N): A Grignard reagent adds to a nitrile to give (after workup) a ketone (imine intermediate hydrolyzed). This consumes 1 equivalent of RMgX. d) Alkyl chloride (-CH(Cl)-CH3): Grignard reagents can undergo substitution (or elimination) with alkyl halides. One equivalent of RMgX is consumed in a coupling/substitution reaction with the secondary alkyl chloride. This consumes 1 equivalent of RMgX. e) Acetate ester (-OC(=O)CH3): This is also an ester. A Grignard reagent adds to this ester twice (similar to the ethyl ester): first addition to give hemiketal-like intermediate losing acetate/methoxide equivalent, then second addition. This consumes 2 equivalents of RMgX. Step 3 - Total count: - Ketone: 1 - Ethyl ester: 2 - Nitrile: 1 - Alkyl chloride: 1 - Acetate ester: 2 Total = 1 + 2 + 1 + 1 + 2 = 7 equivalents of RMgX. Step 4 - Verification: All five reactive sites account for 7 total equivalents, consistent with the given answer. Therefore, the correct answer is 7.