Final answer:
The correct Lewis structure for H₂N₂C₂ is (b) H-N≡C-N=C. The correct Lewis structure for Si₂OH₆ is (c) Si-H-O-H-O-H.
Step-by-step explanation:
In order to determine the correct Lewis structures for H₂N₂C₂ and Si₂OH₆, we need to follow certain rules. For H₂N₂C₂, the correct Lewis structure is (b) H-N≡C-N=C. This structure follows the octet rule and allows each atom to have a full outer shell of electrons.
For Si₂OH₆, the correct Lewis structure is (c) Si-H-O-H-O-H. This structure also follows the octet rule and ensures that each atom has a full outer shell of electrons.