Which one of the following covalent substances could exist as a giant structure?

A SiCl4
B SiO2
C ICl
D Cl2O
E H2S
F CF4

Answer:

6) B

Out of all the options, SiO₂ is the only molecule which can form giant structure. Silicon is a large molecule as has more diffuse valence orbitals. This allows it to form giant structures.