Vitamin B₁₂ deficiency causes pernicious anemia. Animals cannot synthe

Vitamin B₁₂ deficiency causes pernicious anemia. Animals cannot synthesize vitamin B₁₂. Humans must obtain all their vitamin B₁₂ from their diet. The complexing metal ion in vitamin B₁₂ is :

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Mg²⁺ (Magnesium ion)

Fe²⁺ (Iron ion)

Co³⁺ (Cobalt ion)

Zn²⁺ (Zinc ion)

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This question was previously asked in

UPSC CDS-1 – 2016

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Vitamin B₁₂ is also known as cobalamin. Its name is derived from the fact that its structure contains a central cobalt atom coordinated within a corrin ring system. The complexing metal ion in vitamin B₁₂ is Cobalt, typically in the Co³⁺ oxidation state.

Vitamin B₁₂ is named cobalamin because it contains a cobalt ion.

Magnesium (Mg²⁺) is found in chlorophyll. Iron (Fe²⁺/Fe³⁺) is found in hemoglobin and myoglobin. Zinc (Zn²⁺) is a cofactor in many enzymes.

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