A) \[C{{H}_{3}}\] group decreases the electron density on oxygen of OH group making p-cresol a weaker acid
B) \[N{{O}_{2}}\] group decreases electron density on oxygen of OH group making p-nitrophenol a stronger acid
C) \[C{{H}_{3}}\] group increases the electron density on oxygen of OH group making release of \[{{H}^{+}}\]easier
D) \[N{{O}_{2}}\] group increases the electron density on oxygen of OH group making release of \[{{H}^{+}}\] easier.
Correct Answer: B
Solution :
\[N{{O}_{2}}\] group being electron withdrawing group, decreases electron density on oxygen of OH group thus making the release of \[{{H}^{+}}\] easier hence increasing the acidity of phenol. \[C{{H}_{3}}\] group increases the electron density on oxygen atom thus, decreasing acidity than phenol.
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