3
Which of the following Vitamin contains the ‘Corrin ring system’?
EXPLANATION
Coenzymes, Isozymes, & Vitamins
- Corrin Ring System: The core macrocyclic framework of Vitamin $\text{B}_{12}$ (Cobalamin) consists of a corrin ring containing four reduced pyrrole rings linked directly (lacking one methine bridge present in porphyrin) coordinated to a central cobalt ($Co$) ion.
- Comparative Rings: Vitamin $\text{B}_1$ (thiamine) contains thiazole and pyrimidine rings; Vitamin $\text{B}_2$ (riboflavin) contains an isoalloxazine ring; Vitamin $\text{B}_6$ contains a pyridine ring.
Correct option: (4) Vitamin By
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