Which of the following represents the correct decreasing order of acidity of the following compounds?

ii > i > iii > iv

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iv > iii > ii > i

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iii > iv > i > ii

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iv > iii > i > ii

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Solution

The correct option is A iv > iii > i > ii
Electron withdrawing groups $(- N O_{2}, - C N)$ stabilize the phenoxide ion by dispersing the negative charge relative to phenol and increase the acidity of phenol, whereas electron donating groups $(O C H_{3})$ destabilize the phenoxide ion by intensifying the negative charge relative to phenol and tend to decrease the acid strength.

Thus, the order of acidity is iv > iii > i > ii

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

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