Q27 / 180 · AIIMS 2019 (25 May) · Chemistry

Order of acidic nature of the following compounds is Figure
Figure

  • A
    $1>3>4>2$
  • Correct answer
    B
    $1>2>4>3$
  • C
    $1>2>3>4$
  • D
    $4>3>2>1$

Solution

Electron withdrawing group increases the acidic strength of phenols whereas electron donating group decreases the acidic strength of phenols. $o$-Nitrophenol is little less acidic than $p$-nitrophenol due to intramolecular $\mathrm{H}$-bonding which makes loss of a proton little difficult. Figure

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

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