1
Question
How many correct statement regarding the given compounds
1. I is more acidic than II
2. I is less acidic than II
3. III is less acidic than IV
4. III is more acidic than IV
1. I is more acidic than II
2. I is less acidic than II
3. III is less acidic than IV
4. III is more acidic than IV
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Solution
Stability of conjugate base∝Acidic strength
For I and II :
Conjugate base formed :
As seen, −CH3 group shows +I effect and thus destabilizes the negative charge by increasing the electron density. Thus, the stability of conjugate base formed by structure I is less as compared to conjugate base formed by II.
So, I is less acidic than II.
Similarly for III and IV:
−CH3 group shows +I effect and thus destabilizes the negative charge by increasing the electron density. Thus, the stability of conjugate base formed by structure III is less as compared to conjugate base formed by IV.
So, III is less acidic than IV.
So, (2) and (3) are correct.
For I and II :
Conjugate base formed :
As seen, −CH3 group shows +I effect and thus destabilizes the negative charge by increasing the electron density. Thus, the stability of conjugate base formed by structure I is less as compared to conjugate base formed by II.
So, I is less acidic than II.
Similarly for III and IV:
−CH3 group shows +I effect and thus destabilizes the negative charge by increasing the electron density. Thus, the stability of conjugate base formed by structure III is less as compared to conjugate base formed by IV.
So, III is less acidic than IV.
So, (2) and (3) are correct.
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(vi)
(vii)
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