Question

The increasing acidity order of phenol, p-methyl phenol, m-nitrophenol and p-nitrophenol is

• A. phenol, p-methyl phenol, p-nitrophenol, m-nitrophenol
• B. p-methyl phenol, phenol, m-nitrophenol, p-nitrophenol
• C. p-methylphenol, m-nitrophenol, phenol, p-nitrophenol
• D. m-nitrophenol, p-nitrophenol, phenol, p-methylphenol

Answer 1

Answer: (B)

Acidity increases due to $-I$ effect and decreases due to $+I$ effect. Hence, the increasing acidity order is as: p-methyl phenol < phenol < ni-nitrophenol < p-nitrophenol