question_answer 53)

  Which molecule or ion out of the following does not contain unpaired electrons? (a) \[N_{2}^{+}\]                                              (b) \[{{O}_{2}}\]                                               (c)\[O_{2}^{2-}\]                                              (d) \[{{B}_{2}}\]

Answer:

  (c) \[N_{2}^{+}:13\]\[KK\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\pi {{(2{{p}_{x}})}^{2}}\pi {{(2{{p}_{y}})}^{2}}\sigma {{(2{{p}_{z}})}^{1}}\] \[{{O}_{2}}:16\]\[KK\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2{{p}_{z}})}^{2}}\pi {{(2{{p}_{x}})}^{2}}\pi {{(2{{p}_{y}})}^{2}}\]                                                 \[{{\pi }^{*}}{{(2{{p}_{x}})}^{1}}{{\pi }^{*}}{{(2{{p}_{y}})}^{1}}\] \[{{O}^{2-}}:18\]\[KK\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\sigma {{(2{{p}_{z}})}^{2}}\pi {{(2{{p}_{x}})}^{2}}\pi {{(2{{p}_{y}})}^{2}}\]                                                 \[{{\pi }^{*}}{{(2{{p}_{x}})}^{2}}{{\pi }^{*}}{{(2{{p}_{y}})}^{2}}\] \[{{B}_{2}}:10\,\,\,\,\,KK\sigma {{(2s)}^{2}}{{\sigma }^{*}}{{(2s)}^{2}}\pi {{(2{{p}_{x}})}^{1}}\pi {{(2{{p}_{y}})}^{1}}\]