The molecular structure of Si

Problem 14.7 Suggest a molecular orbital description of the frans-bent, high-energy structure of Si2H2. 

Problem 14.8 Compare the bond distances in the most stable form of Si2H2 with the Si-H bond distance in S1H4, 148 pm, and the Si-Si distance in Si2H6, 233 pm, and suggest a description of the bonding in terms of 2c and 3c molecular orbitals. 

---