KCET · Chemistry · p Block Elements (Group 15, 16, 17 & 18)
Which of the following order is true regardingthe acidic nature of phenol?
- A Phenol > O-cresol > o-nitrophenol
- B O-cresol < phenol < O-nitrophenol
- C phenol < O-cresol > O-nitrophenol
- D phenol < O-cresol < O-nitrophenol
Answer & Solution
Correct Answer
(B) O-cresol < phenol < O-nitrophenol
Step-by-step Solution
Detailed explanation
Acidity of the substituted phenols is affected by the nature of the substituents.
Presence of \( e^{-} \)withdrawing group such as \( -\mathrm{NO}_{2} \) increases the acidic strength whereas \( e^{-} \)releasing or donating
groups at 0- and p- position decreases acidic strength of substituted phenol.
In cresol (o- or p- cresol) methyl groups shows + I effect, soit destabilizes the anion formed after ionization hence cresol
is less acidic and o-nitrophenol is more acidic than carbolic acid (phenol). Hence, the correct order for the acidic nature
is o-cresol < phenol < o-nitrophenol.
Presence of \( e^{-} \)withdrawing group such as \( -\mathrm{NO}_{2} \) increases the acidic strength whereas \( e^{-} \)releasing or donating
groups at 0- and p- position decreases acidic strength of substituted phenol.
In cresol (o- or p- cresol) methyl groups shows + I effect, soit destabilizes the anion formed after ionization hence cresol
is less acidic and o-nitrophenol is more acidic than carbolic acid (phenol). Hence, the correct order for the acidic nature
is o-cresol < phenol < o-nitrophenol.
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