Which of the following phenols has the largest $pK_a$ value (i.e.,is least acidic)?

Explain why the reactivity of the benzene ring increases due to the presence of the $-OH$ group in phenol.

Write a note on Kolbe's reaction.

The correct order of acidity of the following is:

Given below are two statements:
Statement $I$: The acidic strength of monosubstituted nitrophenol is higher than phenol because of the electron-withdrawing nitro group.
Statement $II$: $o$-nitrophenol,$m$-nitrophenol,and $p$-nitrophenol will have the same acidic strength as they have one nitro group attached to the phenolic ring.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which statement is true?