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Order of acidic nature of the following compounds is
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$1>2>4>3$
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.
$o$-Nitrophenol is little less acidic than $p$-nitrophenol due to intramolecular $\mathrm{H}$-bonding which makes loss of a proton little difficult.
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