Heat transfer coefficients for free convection in gasses

Question

Heat transfer coefficients for free convection in gases, forced convection in gases and vapors, and for boiling water lie, respectively, in the range of                                                                    

      (a) 5-15, 2-200 and 3000 – 50000 W/m²K

      (b) 20 – 50, 200 – 500 and 5000 – 100000W/m²K

      (c) 50 – 100, 500 – 1000 and 100000 – 1000000 W/m²K

      (d) 20 – 100, 200 – 1000 and a constant 1000000 W/m²K