question_answer

  Give reasons for the following : (a)  is a liquid and is a gas.                                                                                                                                        1 (b) is more reactive than .                                                                                                                                              1 (c) dimerises to form .                                                                                                                                             1

Answer:

                  (a)  is liquid due to presence of intermolecular hydrogen bonding and small size and high electro negativity                 of oxygen atom. In hydrogen bonding is not possible. Thus it is exist as a gas.                                           1       (b) In , the covalent bond between iodine and chlorine is weaker than covalent bond between iodine and iodine in  which makes more reactive.                                                                                                                       The bond dissociation enthalpy of IC1 bond is less than bond dissociation enthelpy of .                                              (c) contains odd number of value electron and paramagnetic in nature.                                                       In liquid and solid state it dimenses to fromwith even number of electrons and dimagnetic in nature.