Assertion (A): Acetamide (structure: \(\text{C}_6\text{H}_5\text{NHCOCH}_3\)) is less basic than aniline. Reason (R): Acetylation of aniline results in decrease of electron density on nitrogen.
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Electron-withdrawing groups like acetyl decrease basicity by reducing lone pair availability on nitrogen through resonance delocalization.
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not the correct explanation of A
A is true but R is false
A is false but R is true
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The Correct Option isA
Solution and Explanation
- Aniline (\(\text{C}_6\text{H}_5\text{NH}_2\)) is more basic than acetanilide (\(\text{C}_6\text{H}_5\text{NHCOCH}_3\)).
- In acetanilide, the lone pair of electrons on nitrogen is delocalized due to resonance with the carbonyl group of the acetyl group (\(-COCH_3\)).
This delocalization reduces the availability of the lone pair on nitrogen for protonation, hence decreasing basicity.
So:
- Assertion is true — acetanilide is less basic than aniline.
- Reason is also true — acetylation pulls electron density away from nitrogen.
- And Reason correctly explains the Assertion.
\[
\boxed{\text{Both A and R are true and R is the correct explanation of A.}}
\]
