AIIMS 2018 Chemistry Grignard Reagents MCQ Question
Assertion : reacts with and forms benzoic acid.
Reason : is an electrophile.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
When phenyl magnesium bromide (C₆H₅MgBr) reacts with carbon dioxide (CO₂), it forms a carboxylic acid, specifically benzoic acid (C₆H₅COOH), after hydrolysis with water (H₂O). This reaction illustrates the nucleophilic addition of the Grignard reagent to the electrophilic carbon of CO₂, resulting in the formation of a carbanion intermediate that ultimately yields the acid upon protonation. Other options are not relevant as they do not represent the products formed in this specific reaction, which is a fundamental aspect of organic synthesis involving Grignard reagents.
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