Q18 / 192 · NTA Abhyas (NEET) 2020 · Chemistry · Alcohols Phenols and Ethers

Increasing order of acid strength among p-methoxyphenol, p-methylphenol and p-nitrophenol is

  • A
    p-nitrophenol, p-methoxyphenol, p-methylphenol
  • B
    p-methylphenol, p-methoxyphenol, p-nitrophenol
  • C
    p-nitrophenol, p-methylphenol, p-methoxyphenol
  • Correct answer
    D
    p-methoxyphenol, p-methylphenol, p-nitrophenol

Solution

-OCH3,-CH3 are electron donating groups so decrease the acidic character of phenols. -NO2,-CN are electron withdrawing groups, tend to increase the acidic character. Hence acidic strength order is

p-methoxyphenol < p-methylphenol < p-nitrophenol.

Hence, the correct answer is option: 'D'.

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