question_answer

Arrange the following compounds in order of decreasing acidity:

A) \[II>IV>I>III\]

B)        \[I>II>III>IV\]

C) \[III>I>II>IV\]

D)        \[IV>III>I>II\]

Correct Answer: C

Solution :

[c] Electron withdrawing substituents like\[-N{{O}_{2}},\]\[-Cl\]increase the acidity of phenol while electron releasing substituents like \[-C{{H}_{3}},\]\[-OC{{H}_{3}}\] decreases acidity, hence the correct order of acidity will be