The image displays chemical structures. Identify each structure.

Chemical Structures Identified:

The image displays four chemical structures:

1. 
   

   Structure 1:

   
   

   This is a general formula for a polysulfuric acid or peroxodisulfuric acid derivative. The structure is HO-S(=O)₂-S_x-S(=O)₂-OH, where 'S_x' indicates a chain of sulfur atoms. If x=1, it would be disulfuric acid. If S_x is an oxygen atom, it represents a peroxosulfuric acid derivative.

   
   


2. 
   

   Structure 2:

   
   

   This structure represents peroxodisulfuric acid (also known as persulfuric acid). Its formula is HO-S(=O)₂-O-O-S(=O)₂-OH.

   
   


3. 
   

   Structure 3:

   
   

   This structure represents disulfuric acid (also known as pyrosulfuric acid or oleum). Its formula is HO-S(=O)₂-O-S(=O)₂-OH.

   
   


4. 
   

   Structure 4:

   
   

   This structure represents sulfuric acid. Its formula is HO-S(=O)₂-OH.

   
   

Summary:

The structures shown are: a general polysulfuric/peroxodisulfuric acid derivative, peroxodisulfuric acid, disulfuric acid, and sulfuric acid.