The increasing order of the acidity of the fo | vedclass

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(A) The acidity of substituted benzoic acids depends on the electronic effects of the substituents at the para position.$1$. $-NO_2$ is a strong elect

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$III < II < IV < I$

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(A) The acidity of substituted benzoic acids depends on the electronic effects of the substituents at the para position.$1$. $-NO_2$ is a strong electron-withdrawing group ($-I$ and $-M$ effects),which significantly increases acidity.$2$. $-Cl$ is an electron-withdrawing group ($-I$ effect) but an electron-donating group ($+M$ effect). The $-I$ effect dominates,increasing acidity compared to benzoic acid.$3$. $-OH$ is an electron-donating group ($+M$ effect),which decreases acidity compared to benzoic acid.$4$. Benzoic acid $(II)$ is the reference.Comparing the substituents: $-NO_2$ (strongest electron-withdrawing) > $-Cl$ (weak electron-withdrawing) > $H$ (no effect) > $-OH$ (electron-donating).Therefore,the increasing order of acidity is $III < II < IV < I$.

List-$I$ (Test)	List-$II$ (Identification)
$A$. Bayer's test	$I$. Phenol
$B$. Ceric ammonium nitrate test	$II$. Aldehyde
$C$. Phthalein dye test	$III$. Alcoholic-$OH$ group
$D$. Schiff's test	$IV$. Unsaturation

The increasing order of the acidity of the following carboxylic acids is:

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