CX4>SiX4 >GeX4 >SnX4>PbX4.
The boiling point of CCl4 is grater than SiCl4 the electronic configuration of
Carbon and silicon is
C(6)→1s2 2s2 2p2
Si(14)→ 1s2 2s2 2p6 3s2 3p2
Here we can see that the ultimate shell of carbon is 2 and the ultimate shell in silicon is 3.
Therefor the size of carbon is smaller than Silicon.
As the size is smaller in carbon the attraction of electrons to the nucleous of carbon is higher and face no shielding effect.
On the other hand in silicon last electrons enter into 3p orbital which feels a slight shielding effect and the bonding partner of thes element is "Cl" which also has a greater size than silicon and carbon.
When it is attached to carbon and silicon, carbon can attract chlorins electron as well its won electron
But silicon is not such as much in carbon.
As a result more energy required to boil CCl4 to SiCl4 though the polarity is greater in SiCl4. And the electronegativity difference is higher in Si-Cl bond than C-Cl bond
This is the perfect ans for this question in many website they answered wrong.
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