Arrange the given phenol & its derivative in their decreasing order of acidity:
Select the correct answer from the give code:

I V > I I I > I > I I

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I V > I I > I I I > I

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I V > I I I > I I > I

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I V > I > I I I > I I

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Solution

The correct option is C $I V > I I I > I I > I$
Acidity of phenol can be viewed as:
$-$ Any electron donating substituent if present at $o -$ or $p -$ position decrease acidity of phenol unit it destabilises the phenoxide ion.
$-$ Any electron with drawing substituent if present at $o$ ort $p -$ position increase acidity of phenol unit it stabilises the phenoxide ion

Given substituent $\to - F, - C l, - N O_{2}$

Electron with drawing strength: $- N O_{2} > - C l > - F$
Thus Correct answer
$(C) I V > I I I > I I > I$

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