Q9 · CSIR-NET Chemistry, December 2012
Paper: CSIR-NET December 2012 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Acidity Basicity · Marks: 2 · Difficulty: Hard
The correct order of acidity of the compounds $A-C$ is: 
A B C
A B C(a)A $>$ B $>$ C
(b)B $>$ C $>$ A
(c)C $>$ A $>$ B
(d)B $>$ A $>$ C
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
Squaric acid (pKa₁ ≈ 1.5) is most acidic. Cyclopentane-1,3-dione (enol, pKa ≈ 4.5) is next. Indane-1,3-dione (pKa ≈ 7) is weakest. C > A > B (c).
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