Tata Sons’ board on Thursday approved a five-year extension for N Chandrasekaran as executive chairman despite opposition from Noel Tata. The board also decided to proceed with listing the Tata Group’s holding company in line with the Reserve Bank of India’s mandate, Tata Sons said in an official statement. However, Tata Trusts disputed the validity of the reappointment resolution, calling it a “legal nullity” under Tata Sons’ Articles of Association. In a statement issued on Thursday, the Trusts said four directors voted in favour of the proposal, while Noel Tata voted against it.