Arrange the following compounds in order of decreasing acidity:

1.	Arrange the following compounds in order of decreasing acidity:
Answer» `III GT I gt II gt IV` `IV gt III gt I gt II` `II gt IV gt I gt III` `I gt II gt III gt IV` Solution :Electron withdrawing groups will increase the acidic character while electron releasing group will decrease the acidic character. Further R- effect is stronger than I-effect. Here, `-Cl` has `-I` effect and `+R` effect, `-CH_(3)` has weak `+I` effect, `-NO_(2)` has `-I` and `-R` effect and `-OCH_(3)` has `-I` and `+R` effect. THUS CORRECT order is : `III gt I gt I gt IV`.

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