Both alcohols and phenols are acidic in nature. but phenols are more acidic than alcohols. Acidic strength of alcohols mainly depends upon the inductive effect. Acidic strength of phenols depends upon a combination of both inductive effect and resonance effects of the substituent and its position on the benzene ring. Electron withdrawing groups increases the acidic strength of phenols whereas electron donating groups decreases the acidic strength of phenols. Phenol is a weaker acid than carboxylic acid.
Most acidic among the following is?

Options

A. (i) `H_2O`
B. (ii) `CH_3CH_2OH`
C.
D.

Answer

(iv)