(D) The statement $D$ is incorrect. Vitamin $B_{12}$ (cyanocobalamine) contains cobalt $(Co^{3+})$ as the central metal ion. Chlorophyll contains magn

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The metal ion present in vitamin $B_{12}$ is $Mg^{2+}$.

(D) The statement $D$ is incorrect. Vitamin $B_{12}$ (cyanocobalamine) contains cobalt $(Co^{3+})$ as the central metal ion. Chlorophyll contains magnesium $(Mg^{2+})$,not vitamin $B_{12}$. All other statements are correct.

Class 12 Chemistry Biomolecules Vitamins

Medium

Which of the following statements is not correct?

AIIMS 2008 All AIIMS

A
Chlorophyll is responsible for the synthesis of carbohydrates in plants.
B
The compound formed by the addition of oxygen to haemoglobin is called oxyhaemoglobin.
C
Acetylsalicylic acid is known as aspirin.
D
The metal ion present in vitamin $B_{12}$ is $Mg^{2+}$.