Here's why:

* Solubility is based on the "like dissolves like" principle. This means substances with similar polarities (how evenly electrons are distributed) tend to dissolve in each other.

* Carbon tetrachloride (CCl4) is a nonpolar solvent. This means its electrons are distributed relatively evenly, resulting in no significant positive or negative charges.

* Sulphur (S) is a nonpolar element. However, it exists as a solid with a complex, crystalline structure. This structure makes it difficult for sulphur to interact with the nonpolar molecules of carbon tetrachloride.

Therefore, even though both are nonpolar, the solid nature and the complex structure of sulphur prevent it from dissolving in carbon tetrachloride.