Noel Tata, chairman of Tata Trusts, has challenged the Tata Sons board resolution to reappoint N Chandrasekaran as chairman of the holding company of the Tata group, terming the decision void on procedural grounds and escalating the differences within the conglomerate’s leadership. In a letter to Tata Sons company secretary Suprakash Mukhopadhyay on October 26, Noel questioned the resolution passed at the September 17 board meeting to extend Chandrasekaran’s tenure beyond February 2027, sources familiar with the development said.