question_answer

  (i) Sulphur exhibits tendency for catenation but oxygen does not. (ii) The electron affinity of fluorine is less than that of chlorine. (iii) All the bonds in  are not equivalent. (iv) Fluorine is the strongest oxidant amongst the halogens.

Answer:

  (i) Due to lower ionisation enthalpy Xe combines with strong oxidising agent like O & F and forms various noble as compounds. (ii) Fluorine can not show valency more than one but chlorine can show valency 1, 3, 5 and 7 due to presence F d-orbital. (ii) Of all the hydrides of group -16 elements,  shows unusual properties due to more polar O - H bond and formation of H - bonding.