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Such questions can be solved by considering the relative basic character of their conjugate bases which for H2O, C2H2, H2CO3, and C6H5OH are?

1. OH, HC–C, HCO3–, C6H5O–
2. HC–C, OH, C6H5O–, HCO3–
3. HCO3–, C6H5O–, OH, HC–C
4. C6H5O–, HCO3–, HC–C, OH

Correct answer: OH, HC–C, HCO3–, C6H5O–

Solution

The relative basic character of conjugate bases depends on the stability of the conjugate base. OH⁻ is the strongest base, followed by HC≡C⁻, HCO₃⁻, and C₆H₅O⁻, as phenoxide ion is resonance-stabilized and least basic.

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