question_answer 41)

    Bond dissociation enthalpy of E?H (E= element) bonds is given below. Which of the compounds will act as strongest reducing agent?

Compound
	389	322	297	255

  (a)                                (b)            (c)                               (d)

Answer:

                    (d) On moving top to bottom, size of central atom increases. Bond length of X?H bond increases and bond dissociation energy decreases. Hence, reducing nature increases.                         ? Bond length increases      ? Bond dissociation energy decreases                      ? Reducing character increases                       Hence, is act as strongest reducing agent among these.