• # question_answer 53)   Catenation, i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in group 14 elements follows the order : (a) $C\text{ }>\text{ }Si>\text{ }Ge\text{ }>\text{ }Sn$                                                                (b) $C\text{ }>\text{ }Si\text{ }>\text{ }Ge\text{ }\approx \text{ }Sn$ (c) $Si\text{ }>\text{ }C\text{ }>\text{ }Sn\text{ }>\text{ }Ge$                                 (d)  $Ge\text{ }>\text{ }Sn\text{ }>\text{ }Si\text{ }>\text{ }C$

(b) The decrease in catenation property is linked with M-M bond energy which decreases from carbon to tin. $C-C$                                  $Si-Si$     83 kcal/mol                         54 kcal/mol $GeGe~~~~$                  $SnSn$ 40 kcal/mol                         37 kcal/mol Thus, two options (a) and (b) are correct in this question but option (b) is more appropriate. $C>>Si$                                             >             $Ge\approx Sn$ Large difference in energy                           Small difference in energy