The given structures are `:

IUPAC names of the given structure are

IUPAC names of the given structure are

In the given structure

In the given structure

Given structure is ?

Given structure is ?

The given structures indicate the valency of carbon. Imagine that hy-drogen atoms are added to these structures. Complete the given structures.

The given structure was called by another name before the postulation of the genetic code. It was known as:

The given structures I, II and III of carbonate ion represent