The increasing order of acidity of the following carboxylic acids is

Options

A. `III gt IV gt II gt I`
B. `II gt III gt II gt I`
C. `I gt II gt IV gt III`
D. `III gt IV gt I gt II`

Answer

D

Explanation

(i) `- NO_(2)` group show -l effect thus increases the acidic nature
(ii) `- OCH_(3) and CH_(3)` are electron donating groups, thus decreases the acidic nature. But `-OCH_(3)` will decrease acidic nature more than of `-CH_(3)` group
Hence, correct order is
`c lt d lt a lt b`