question_answer 46)

  Polarity in a molecule and hence the dipole momentdepends primarily on electronegativity of the constituentatoms and shape of molecule. Which of the following has the highest dipole moment?          (a) \[C{{O}_{2}}\]                             (b) \[HI\]                                             (c)\[{{H}_{2}}O\]                                              (d) \[S{{O}_{2}}\]

Answer:

  (c) Both \[{{H}_{2}}O\] and \[S{{O}_{2}}\] have same shape but the electro-negativity difference of O and H is more than S and O. Electro negativity of H, O and S are 2.1, 3.5 and 2.5 respectively.