Which of the following is correct order of acidic strength for the given compounds:

I > I I > I I I > I V

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I I > I > I I I > I V

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I I > I I I > I > I V

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I > I I I > I I > I V

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Solution

The correct option is C $I I > I I I > I > I V$
It is evident that $I I$ is the most acidic. Addition of a +I $(- C H_{3})$ group will decrease its acidity. Again, addition of -I $(- N O_{2})$ group to phenol will increase its acidity as comapared to $I V$ . Hence the correct order is :
$I I > I I I > I > I V$
Therefore, Option C is the correct answer.

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Similar questions

Mark the correct order of decreasing acid strength of the following compounds.

(a) V > IV > II > I > III
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(d) V > IV > III > II > I

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ii. M – cresol

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