<Li> Natarajan Chandrasekaran (2017--Present) </Li> <P> This section lists the Tata companies and details their business: </P> <Ul> <Li> Tata Chemicals </Li> <Li> Advinus Therapeutics </Li> <Li> Brunner Mond </Li> <Li> General Chemical Industrial Products </Li> <Li> Magadi Soda Company </Li> <Li> Rallis India </Li> <Li> Tata Pigments Limited </Li> </Ul> <Li> General Chemical Industrial Products </Li>

Which is the oldest surviving business of the tata group