A) \[{{k}_{1}}\]
B) \[{{k}_{2}},\]
C) \[I\]
D) \[{{I}_{0}}\]
Correct Answer: C
Solution :
Due to inert pair effect, the stability of +2 oxidation state increases as we move down this group. \[\therefore \] \[Si{{X}_{2}}<Ge{{X}_{2}}<Sn{{X}_{2}}<Pb{{X}_{2}}\]
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