Q7 · CSIR NET Chemistry, December 2016
Paper: CSIR NET December 2016 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Acidity Basicity · Marks: 2 · Difficulty: Hard
The correct order of the acidity for the following compounds is 
A 
B 
C
A B C(a)B $>$ C $>$ A
(b)$\mathrm{C}>\mathrm{B}>\mathrm{A}$
(c)B $>$ A $>$ C
(d)C $>$ A $>$ B
Answer
Answer: C ✓ checked by 4AB · confidence medium
Explanation
Cyclic 1,3-diketones are more acidic than acetylacetone because their enolates stay planar and cannot twist; the five-membered dione (pKa ≈ 4.6) is slightly more acidic than the six-membered one (5.3), and acetylacetone (≈9) is least. B > A > C.
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