The strongest acid in the following compounds is:

phenol

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p-cresol

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m-nitrophenol

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p-nitrophenol

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Solution

The correct option is B 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 $H$ , $- N O_{2}$ group in $o$ and $p$ position provides $- M$ effect as the negative charge delocalizes.

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C H_{2} = C H_{2} H_{3} O^{+} - -- \to C H_{3} - C H_{2}^{+} + H_{2} O

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