Question
The strongest acid in the following compounds is:

Answer

$o-$nitro phenol participates in intra$-$molecular $H-$bonding, which makes it less acidic than p-nitro phenol. Since acidic strength depends on the stability of negative ion after removal of acidic $H, −NO_2​$ group in o and p position provides $-M$ effect as the negative charge delocalizes.

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