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Question:
What is the correct order of acidity of compounds I, II and III?
i. 4-Nitrobenzoic acid
ii. 4-Methoxy Benzoic acid
iii. Benzoic acid
What is the correct order of acidity of compounds I, II and III?
i. 4-Nitrobenzoic acid
ii. 4-Methoxy Benzoic acid
iii. Benzoic acid
i. 4-Nitrobenzoic acid
ii. 4-Methoxy Benzoic acid
iii. Benzoic acid
Updated On: Apr 30, 2024
- I>III>II
- I>II>III
- I<II<III
- I<III<II
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The Correct Option is A
Solution and Explanation
The correct answer is option (A): I>III>II
The acidity can be determined by the stability of the conjugate base formed after losing a proton. More stable the conjugate more stronger the acid. I: 4-Nitrobenzoic acid: it has a strong electron-withdrawing group. The negative charge on the base is stabilized by the electron-withdrawing effect of the nitro group. II 4-Methoxybenzoic acid: The methoxy group is attached to the beneze ring. The Methoxy group is electron donating but is not as effective as the nitro group. III Benzoic acid: It has no substituent group Therefore, the order of acidity will be I>III>II
The acidity can be determined by the stability of the conjugate base formed after losing a proton. More stable the conjugate more stronger the acid. I: 4-Nitrobenzoic acid: it has a strong electron-withdrawing group. The negative charge on the base is stabilized by the electron-withdrawing effect of the nitro group. II 4-Methoxybenzoic acid: The methoxy group is attached to the beneze ring. The Methoxy group is electron donating but is not as effective as the nitro group. III Benzoic acid: It has no substituent group Therefore, the order of acidity will be I>III>II
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