Q17 · CSIR NET Chemistry, December 2019
Paper: CSIR NET December 2019 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Acidity Basicity · Marks: 2 · Difficulty: Hard
The correct order of pKa of the following compounds is 
A 
B 
C
A B C(a)$\mathrm{C}>\mathrm{B}>\mathrm{A}$
(b)$\mathrm{A}>\mathrm{C}>\mathrm{B}$
(c)$\mathrm{B}>\mathrm{A}>\mathrm{C}$
(d)$\mathrm{A}>\mathrm{B}>\mathrm{C}$
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
pKa: cyclopropene (A, anion antiaromatic, ~61) > cycloheptatriene (C, ~36) > cyclopentadiene (B, aromatic anion, 16). A > C > B (b).
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