AIIMS 2019 Chemistry Aromatic Compounds MCQ Question
Assertion: Anhydrides are more reactive than ester for nucleophilic substitution.
Reason:– is better leaving group than
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
The reaction is classified as aromatic electrophilic substitution because it involves the substitution of a hydrogen atom on an aromatic ring by an electrophile, maintaining the aromaticity of the compound. In this process, the electrophile attacks the π-electron cloud of the aromatic system, leading to the formation of a sigma complex before the aromaticity is restored by the loss of a proton (H⁺).
Other options are incorrect as nucleophilic substitution typically involves a nucleophile attacking an electrophilic carbon in aliphatic compounds, elimination reactions result in the removal of small molecules (like H₂O or HCl) to form double or triple bonds, and addition reactions involve the addition of atoms or groups across a double bond, which does not apply to the preservation of aromaticity in this context.
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