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  4. The correct order of acidity of the following compounds is

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Q. The correct order of acidity of the following compounds isChemistry Question Image

KVPYKVPY 2015

Solution:

Electron donating substituents tends to decrease the acidic strength while electron withdrawing substituents tends to increase the acidic strength of substituted benzoic acids relative to benzoic acid. $OCH _{3}$ exerts $+M$ effect which destabilises the conjugate base
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of the compound $2$ and hence decreases the acidity, whereas $NO _{2}$ exerts $-M$ effect and stabilises the conjugate
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hence increases the acidity. Thus, the correct order of acidity of the given compounds are
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