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Which of the following statements is incorrect?
- a)Phenols are oxidised in air to dark coloured mixtures
- b)Reimer-Tiemann reaction is example of electrophilic substitution reaction
- c)Lucas test is used to identify 1°, 2° and 3° alcohols
- d)o-Methylphenol is more acidic than phenol due to ortho effect
Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements is incorrect?a)Phenols are oxidised...
No ortho effect is found in o-Methylphenol. It is less acidic due to electron donating nature of methyl group.
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Which of the following statements is incorrect?a)Phenols are oxidised...
Incorrect Statement: Option D
The statement "o-Methylphenol is more acidic than phenol due to ortho effect" is incorrect. Here's why:
Understanding Acidity in Phenols
- Phenol Structure: Phenol (C6H5OH) has a hydroxyl (-OH) group attached to a benzene ring, which allows it to donate a proton (H+) and exhibit acidic behavior.
- o-Methylphenol: This compound, also known as 2-methylphenol, has a methyl group (-CH3) attached to the ortho position of the hydroxyl group on the benzene ring.
Ortho Effect
- Ortho Effect Explained: The ortho effect refers to the increased acidity observed in ortho-substituted phenols compared to their unsubstituted counterparts. However, this effect can vary based on the nature of the substituent.
- Impact of Methyl Group: In the case of o-methylphenol, the presence of the methyl group actually destabilizes the negative charge on the phenoxide ion (the conjugate base formed after deprotonation of phenol). This destabilization occurs due to steric hindrance and electron-donating effects.
Comparative Acidity
- Acidity Order: The acidity order is as follows:
- Phenol > o-Methylphenol > p-Methylphenol
- Thus, o-Methylphenol is less acidic than phenol.
Conclusion
- Final Note: Therefore, the statement that o-methylphenol is more acidic than phenol is incorrect due to the destabilizing effects of the ortho methyl group on the conjugate base, making phenol the more acidic compound.
The statement "o-Methylphenol is more acidic than phenol due to ortho effect" is incorrect. Here's why:
Understanding Acidity in Phenols
- Phenol Structure: Phenol (C6H5OH) has a hydroxyl (-OH) group attached to a benzene ring, which allows it to donate a proton (H+) and exhibit acidic behavior.
- o-Methylphenol: This compound, also known as 2-methylphenol, has a methyl group (-CH3) attached to the ortho position of the hydroxyl group on the benzene ring.
Ortho Effect
- Ortho Effect Explained: The ortho effect refers to the increased acidity observed in ortho-substituted phenols compared to their unsubstituted counterparts. However, this effect can vary based on the nature of the substituent.
- Impact of Methyl Group: In the case of o-methylphenol, the presence of the methyl group actually destabilizes the negative charge on the phenoxide ion (the conjugate base formed after deprotonation of phenol). This destabilization occurs due to steric hindrance and electron-donating effects.
Comparative Acidity
- Acidity Order: The acidity order is as follows:
- Phenol > o-Methylphenol > p-Methylphenol
- Thus, o-Methylphenol is less acidic than phenol.
Conclusion
- Final Note: Therefore, the statement that o-methylphenol is more acidic than phenol is incorrect due to the destabilizing effects of the ortho methyl group on the conjugate base, making phenol the more acidic compound.
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Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer?
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Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer?.
Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer?.
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Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Which of the following statements is incorrect?a)Phenols are oxidised in air to dark coloured mixturesb)Reimer-Tiemann reaction is example of electrophilic substitution reactionc)Lucas test is used to identify 1°, 2° and 3° alcoholsd)o-Methylphenol is more acidic than phenol due to ortho effectCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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