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Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Carboxylic acids are more acidic than phenols.
Reason (R): Phenols are ortho and para directing.
Assertion (A): Carboxylic acids are more acidic than phenols.
Reason (R): Phenols are ortho and para directing.
- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R are true but R is NOT the correct explanation of A
- c)A is true but R is false
- d)A is false and R is True
Correct answer is option 'B'. Can you explain this answer?
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Directions : In this question, A statement of Assertion (A) is followe...
Carboxylic acids are more acidic than phenols as the carboxylate ion, the conjugate base of carboxylic acid is stabilized by two equivalent resonance structures. Thus, the negative charge is delocalized effectively. However, in phenols, negative charge is less effectively delocalized over oxygen atom and carbon atoms in phenoxide ion.
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Directions : In this question, A statement of Assertion (A) is followe...
Assertion (A): Carboxylic acids are more acidic than phenols.
Reason (R): Phenols are ortho and para directing.
The correct answer is option B - Both A and R are true, but R is NOT the correct explanation of A.
Explanation:
Acidity of Carboxylic Acids:
- Carboxylic acids contain the carboxyl group (-COOH), which consists of a carbonyl group (-C=O) and a hydroxyl group (-OH).
- The presence of the highly electronegative oxygen atom in the carbonyl group makes the hydrogen in the hydroxyl group more acidic.
- The electron-withdrawing effect of the carbonyl group stabilizes the conjugate base formed after the loss of a proton, making the ionization of carboxylic acids easier and increasing their acidity.
Acidity of Phenols:
- Phenols are aromatic compounds that contain a hydroxyl group (-OH) attached to a benzene ring.
- The hydroxyl group in phenols also exhibits acidic behavior due to the presence of the highly electronegative oxygen atom.
- However, the electron-donating nature of the benzene ring decreases the acidity of phenols compared to carboxylic acids.
- The electron-donating effect of the benzene ring destabilizes the phenoxide ion formed after the loss of a proton, making the ionization of phenols less favorable and decreasing their acidity.
Ortho and Para Directing:
- Ortho and para directing refers to the ability of a substituent on a benzene ring to direct incoming groups to the ortho and para positions during electrophilic aromatic substitution reactions.
- This property is not directly related to the acidity of carboxylic acids or phenols.
- While phenols are indeed ortho and para directing due to the electron-donating nature of the benzene ring, this does not have a significant impact on their acidity compared to carboxylic acids.
Conclusion:
Although both the assertion and reason are true, the reason provided does not explain why carboxylic acids are more acidic than phenols. The acidity of carboxylic acids is primarily due to the presence of the electron-withdrawing carbonyl group, while the lower acidity of phenols is attributed to the electron-donating nature of the benzene ring. The ortho and para directing property of phenols is not directly correlated with their acidity.
Reason (R): Phenols are ortho and para directing.
The correct answer is option B - Both A and R are true, but R is NOT the correct explanation of A.
Explanation:
Acidity of Carboxylic Acids:
- Carboxylic acids contain the carboxyl group (-COOH), which consists of a carbonyl group (-C=O) and a hydroxyl group (-OH).
- The presence of the highly electronegative oxygen atom in the carbonyl group makes the hydrogen in the hydroxyl group more acidic.
- The electron-withdrawing effect of the carbonyl group stabilizes the conjugate base formed after the loss of a proton, making the ionization of carboxylic acids easier and increasing their acidity.
Acidity of Phenols:
- Phenols are aromatic compounds that contain a hydroxyl group (-OH) attached to a benzene ring.
- The hydroxyl group in phenols also exhibits acidic behavior due to the presence of the highly electronegative oxygen atom.
- However, the electron-donating nature of the benzene ring decreases the acidity of phenols compared to carboxylic acids.
- The electron-donating effect of the benzene ring destabilizes the phenoxide ion formed after the loss of a proton, making the ionization of phenols less favorable and decreasing their acidity.
Ortho and Para Directing:
- Ortho and para directing refers to the ability of a substituent on a benzene ring to direct incoming groups to the ortho and para positions during electrophilic aromatic substitution reactions.
- This property is not directly related to the acidity of carboxylic acids or phenols.
- While phenols are indeed ortho and para directing due to the electron-donating nature of the benzene ring, this does not have a significant impact on their acidity compared to carboxylic acids.
Conclusion:
Although both the assertion and reason are true, the reason provided does not explain why carboxylic acids are more acidic than phenols. The acidity of carboxylic acids is primarily due to the presence of the electron-withdrawing carbonyl group, while the lower acidity of phenols is attributed to the electron-donating nature of the benzene ring. The ortho and para directing property of phenols is not directly correlated with their acidity.
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Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Carboxylic acids are more acidic than phenols.Reason (R): Phenols are ortho and para directing.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'B'. Can you explain this answer?
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Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Carboxylic acids are more acidic than phenols.Reason (R): Phenols are ortho and para directing.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'B'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Carboxylic acids are more acidic than phenols.Reason (R): Phenols are ortho and para directing.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Carboxylic acids are more acidic than phenols.Reason (R): Phenols are ortho and para directing.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Carboxylic acids are more acidic than phenols.Reason (R): Phenols are ortho and para directing.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
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ample number of questions to practice Directions : In this question, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.Assertion (A): Carboxylic acids are more acidic than phenols.Reason (R): Phenols are ortho and para directing.a)Both A and R are true and R is the correct explanation of Ab)Both A and R are true but R is NOT the correct explanation of Ac)A is true but R is falsed)A is false and R is TrueCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Class 12 tests.
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