Organisms that obtain energy by the oxidation of reduced inorganic compounds are called?
 

Concept: The organisms obtaining energy by chemical reactions independent of height are called chemotrophs. 
The reluctant obtained from the environment may be inorganic or organic. 
Photoautotroph organisms make their food by photosynthesis, using light energy. 
Saprozoic organisms obtain food from dead and decaying matter.
Hence, option 2 is correct.