question_answer 68)

    Which of the following orders are correct as per the properties mentioned against each? (a)        Acid strength. (b)                  Enthalpy of vaporisation. (c)                       More negative electron gain enthalpy. (d)           Thermal stability.

Answer:

                    (a, d) (a) (b) Correct order is (c) S < O < Cl < F More negative electron gain enthalpy                      . (d)  Thermal stability decreases on moving top to bottom due to increase in its bond length.