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(B) The acidic strength of phenols is increased by electron-withdrawing groups $(EWG)$ and decreased by electron-donating groups $(EDG)$.$pK_{a}$ is i

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$(B) < (D) < (A) < (C) < (E)$

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(B) The acidic strength of phenols is increased by electron-withdrawing groups $(EWG)$ and decreased by electron-donating groups $(EDG)$.$pK_{a}$ is inversely proportional to acidic strength. Higher acidic strength means lower $pK_{a}$ value.$(A)$ Phenol$(B)$ $p$-Nitrophenol: $-NO_2$ has strong $-M$ and $-I$ effects, making it the strongest acid.$(C)$ $m$-Methoxyphenol: $-OCH_3$ has a $-I$ effect (at meta position), increasing acidity compared to phenol.$(D)$ $o$-Nitrophenol: $-NO_2$ has $-I$ and $-M$ effects, but intramolecular $H$-bonding makes it slightly weaker than $p$-nitrophenol.$(E)$ $p$-Methoxyphenol: $-OCH_3$ has a strong $+M$ effect, which significantly decreases acidity, making it the weakest acid.Acidic strength order: $(B) > (D) > (A) > (C) > (E)$.Since $pK_{a} \propto \frac{1}{ ext{acidic strength}}$, the increasing order of $pK_{a}$ is: $(B) < (D) < (A) < (C) < (E)$.

For the given compounds, the correct order of increasing $pK_{a}$ value is:

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