(C) The acidity of a compound is determined by its dissociation constant $(K_a)$.Phenol $(C_6H_5OH)$ has a $K_a$ value in the range of $10^{-8}$ to $1

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(C) The acidity of a compound is determined by its dissociation constant $(K_a)$.Phenol $(C_6H_5OH)$ has a $K_a$ value in the range of $10^{-8}$ to $10^{-10}$.Carbonic acid $(H_2CO_3)$ has a $K_a$ value of approximately $10^{-7}$.Since the $K_a$ of phenol is lower than that of carbonic acid,phenol is a weaker acid than carbonic acid.