The correct order of the pKa values for the conjugate acids of heterocyclic compounds given below is (I) (II)… · ABC26OR0785

Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Acidity Basicity · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Hard

The correct order of the pKa values for the conjugate acids of heterocyclic compounds given below is (I) (II) (III) (IV)

(a)II $>$ III $>$ I $>$ IV

(b)IV $>$ II $>$ III $>$ I

(c)III $>$ II $>$ IV $>$ I

(d)III $>$ IV $>$ II $>$ I

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

Conjugate-acid pKa: pyrrolidine 11.3 (III) > aziridine 8.0 (II) > pyridine 5.2 (IV) > pyrrole ≈ −4 (I) (c).

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