Question:
The increasing order of acidity of the given molecules in aqueous media is
The increasing order of acidity of the given molecules in aqueous media is
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Electron-withdrawing groups like fluorine in fluoroacetic acid increase the acidity by stabilizing the negative charge on the conjugate base.
Updated On: Dec 11, 2025
- IV < I < II < III
- II < I < IV < III
- II < IV < I < III
- IV < II < I < III
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The Correct Option is C
Solution and Explanation
Step 1: Understanding acidity.
The acidity of compounds depends on the ability to donate a proton (H$^+$). In aqueous media, electron-withdrawing groups increase acidity, while electron-donating groups decrease acidity. The presence of an electronegative substituent like F in fluoroacetic acid makes it more acidic than acetic acid or phenol. Alcohols, like methanol (CH$_3$OH), are the least acidic.
Step 2: Conclusion.
The increasing order of acidity is CH$_3$OH (IV) > acetic acid (II) > phenol (I) > fluoroacetic acid (III), corresponding to option (D).
The acidity of compounds depends on the ability to donate a proton (H$^+$). In aqueous media, electron-withdrawing groups increase acidity, while electron-donating groups decrease acidity. The presence of an electronegative substituent like F in fluoroacetic acid makes it more acidic than acetic acid or phenol. Alcohols, like methanol (CH$_3$OH), are the least acidic.
Step 2: Conclusion.
The increasing order of acidity is CH$_3$OH (IV) > acetic acid (II) > phenol (I) > fluoroacetic acid (III), corresponding to option (D).
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