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Among the following four compounds[2010] (i) phenol (ii) methylphenol (iii) meta-nitrophenol (iv) para-nitrophenol the acidity order is :
- a)ii > i > iii > iv
- b)iv > iii > i > ii
- c)iii > iv > i > ii
- d)i > iv > iii > ii
Correct answer is option 'B'. Can you explain this answer?
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Among the following four compounds[2010] (i) phenol (ii) methylphenol ...
(– I and – M effects, (only – I effect) both increase acidity)
(+ I effect of CH3 group decreases acidity)
∴ Correct choice : (b)
∴ Correct choice : (b)
Most Upvoted Answer
Among the following four compounds[2010] (i) phenol (ii) methylphenol ...
> iii > iv > i
Explanation: The acidity of phenols is determined by the electron-donating or withdrawing groups attached to the benzene ring. In this case, the presence of a methyl group in methylphenol (ii) increases the electron density on the phenol ring, making it more acidic than phenol (i). The presence of a nitro group in meta-nitrophenol (iii) and para-nitrophenol (iv) withdraws electron density from the phenol ring, making them more acidic than phenol (i) but less acidic than methylphenol (ii). The meta-nitrophenol (iii) is more acidic than para-nitrophenol (iv) due to the position of the nitro group relative to the hydroxyl group.
Explanation: The acidity of phenols is determined by the electron-donating or withdrawing groups attached to the benzene ring. In this case, the presence of a methyl group in methylphenol (ii) increases the electron density on the phenol ring, making it more acidic than phenol (i). The presence of a nitro group in meta-nitrophenol (iii) and para-nitrophenol (iv) withdraws electron density from the phenol ring, making them more acidic than phenol (i) but less acidic than methylphenol (ii). The meta-nitrophenol (iii) is more acidic than para-nitrophenol (iv) due to the position of the nitro group relative to the hydroxyl group.
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Among the following four compounds[2010] (i) phenol (ii) methylphenol (iii) meta-nitrophenol (iv) para-nitrophenol the acidity order is :a)ii > i > iii > ivb)iv > iii > i > iic)iii > iv > i > iid)i > iv > iii > iiCorrect answer is option 'B'. Can you explain this answer?
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