MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryGOCPrevious Year Questions
The correct order of acidity of the following compounds is (CPMT 2010)
A.RCOOH > C2H2> H2O > ROH
B.RCOOH > ROH > H2O > C2H2
C.RCOOH > ROH > C2H2> H2O
D.RCOOH > H2O > ROH > C2H2✓ Correct
Explanation
Stronger acid has the most stable conjugate base. RCOOH has the stronger acidity among them. We can determine the acidic strength using the conjugate base of the acids. RCOOfrom RCOOH is the strongest acid since the negative charge can be delocalized among the two oxygen atoms giving it the highest stability. OHis the conjugate base of 2 H O . It is less stable than RCOOdue to the inability to delocalize the negative charge. ROis the conjugate base of ROH and the R group has +I effect. Thus, it destabilizes the negative charge making the conjugate base less stable than OH. CH C is the
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