Which of the following is not an interstitial compound?
The correct option is C SiC
Interstitial compounds are compounds in which a smaller atom of one element is trapped in a space in the lattice structure of another element. Transition metals have many interstitial sites in their structure that can trap small atoms like those of hydrogen, nitrogen, boron, and carbon.
Among the given options, $$Ti$$ and $$V$$ are transition metals and the compounds they form are interstitial compounds. $$Si$$ in $$SiC$$ is not a transition metal.