Which is the correct order of acid strength from the following? A). C$_6$H$_5$OH > H$_2$O > ROH B). C$_6$H$_5$OH > ROH > H$_2$O C). ROH > C$_6$H$_5$OH > H$_2$O D). H$_2$O > C$_6$H$_5$OH > ROH

The correct answer is C$_6$H$_5$OH > H$_2$O > ROH. Acid strength depends on the stability of the conjugate base: - **Phenol:** Phenoxide ion is resonance-stabilised by the benzene ring. Most acidic. - **Water:** OH$^-$ is more stable than alkoxide (smaller, less polarisable). - **Alcohol:** Alkoxide destabilised by +I effect of alkyl group. Least acidic. $$\text{C}_6\text{H}_5\text{OH} > \text{H}_2\text{O} > \text{ROH}$$

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