Which of the following are water-soluble vitamins?

The deficiency of vitamin $x$ causes beri beri and deficiency of vitamin $y$ causes convulsions. What are $x$ and $y$ respectively?

The vitamin which is water-soluble and acts as an antioxidant is:

What is the chemical name of vitamin $B_6$?

$A$ vitamin $X$ is soluble in fat and its source is egg yolk. Deficiency of $X$ causes the disease:

Write a note on vitamins.