Discussion
The bond length of the tetrachlorides for the following Group IV elements follows the order :
Answer: C
The order is GeCl4 > SiCl4 > CCl4.
In a group, the covalent radius of the central atom grows as a new shell is added: C (about 77 pm), Si (about 117 pm), Ge (about 122 pm). The E-Cl bond lengthens with it, from about 177 pm in CCl4 to about 202 pm in SiCl4 and about 210 pm in GeCl4.
Options A and B put SiCl4 first, ignoring that germanium is larger than silicon, and option D places CCl4, with the smallest central atom, above SiCl4.
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