posted by jagadheeswar
who are the fathers of following subjects
These are subjective and, for example, depends on which time frame you choose. I suggest you choose someone and have a few reasons why you have chosen the particular person.
As an example, for a modern father of chemistry (organic chemistry) I would choose Robert Burns Woodward. http://en.wikipedia.org/wiki/Robert_Burns_Woodward
He moved organic chemistry forward quite significantly, we now have Woodward rules in UV spectroscopy for finding out structures, the Woodward Hoffmann rules which predicts how some molecules will react. He also came up with the synthesis of a number of important organic compounds such as quinine.
I planned to work with him as a researcher, but unfortuately he died before I could take up the place.