law: Company Law Board Regulations, 1991 
  5. Vacancy in the
  
  office of the Chairman -
  If, for any reasons,
  
  the Chairman is not appointed or a casual vacancy occurs in the office of the
  
  Chairman, the senior most member of the Board, holding office of member for the
  
  time being, shall discharge the functions of the Chairman until a person is
  
  appointed as the Chairman.