The extent of π-electron conjugation in macrocyclic rings of (1) heme, (2) coenzyme B₁₂ and (3) chlorophyll… · ABC26IN0874
Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Bioinorganic Chemistry – General · Exam: CSIR NET DEC 2014 · Marks: 2 · Difficulty: Medium
The extent of $\pi$-electron conjugation in macrocyclic rings of (1) heme, (2) coenzyme $\mathrm{B}_{12}$ and (3) chlorophyll follows the order
(a)$(1)>(3)>(2)$
(b)$(1)>(2)>(3)$
(c)$(3)>(1)>(2)$
(d)$(2)>(1)>(3)$
Answer
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Explanation
Heme (porphyrin) is fully conjugated; chlorophyll (chlorin) has one reduced pyrrole ring; the corrin of B₁₂ is the least conjugated. Order 1 > 3 > 2.
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