MCQ
The strongest acid in the following compounds is:
- Aphenol
- B$p-$cresol
- C$m-$nitrophenol
- ✓$p-$nitrophenol
✓
Answer
Correct option: D.
$p-$nitrophenol
$o-$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 $H, -\mathrm{NO}_2$ group in $o$ and $p$ position provides $−M$ effect as the negative charge delocalizes.
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