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)C $>$ B $>$ A

(b)A $>$ C $>$ B

(c)B $>$ A $>$ C

(d)A $>$ B $>$ 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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