Which one of the following vitamins contains a metal atom ?

Options

A. vitamin `B_(6)`
B. vitamin `B_(2)`
C. vitamin `B_(12)`
D. vitamin A

Answer

B

Explanation

Vitamin `B_(12)` contains cobalt and is thus known as cyanochobalamine. Due to cobalt ions, the aqueous solution of vitamin `B_(12)` is dark pink in colour. Vitamin `B_(12)` contains a closed system containing four pyrrole nuclie joined through three bridge carbons, called corrin. Pernicious anemia is caused by the deficiency of vitamin `B_(12)`
The chemical name of vitamins `A` is retinol. Night-blindness may develop due to the deficiency of vitamin `A` Deficiency of vitamin A can be compensated by regular intake of carrots. vitamin `A`, a fat soluble vitamin, does not function as a coenzyme. The carbon skeleton of vitamin a is constituted by the head - to - tail union of isoprene units. It possesses a primary alcoholic group with successive conjugation of five carbon - carbon double bonds. Cod liver oil is a good source of vitamin A. `beta`- carotene is provitamin `A`.
Cracking of lips and corners of mouth, and sealy skin are the dificiency symptoms of vitamins `B_(2)`. The chemical name of vitamin `B_(2)` is riboflavin. It contains a sugar unit. The chemical name of vitamins `B_(6)` is pyridoxine. Its deficiency disease is convulsions (break dance).