Vitamin $\mathrm{B}_{12}$ is a complex of

Vitamin $\mathrm{B}_{12}$ is a complex of
  1. cobalt(II) ion
  2. cobalt(III) ion
  3. chromium(II) ion
  4. chromium(III) ion

Solution

Vitamin $\mathrm{B}_{12}$ is a complex of cobalt. It is cyanocobalamin $\left(\mathrm{C}_{63} \mathrm{H}_{88} \mathrm{CoN}_{14} \mathrm{O}_{14} \mathrm{P}ight)$. Its main sources are meat, fish, egg, milk etc. Its deficincy is responsible for pernicious anaemia.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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