In the solid state, methyllithium is tetrameric and has a Li4 core. The correct statement about the structure and bonding in methyllithium is
1
Each methyl anion is bridging between two Li-centres via 3-center-2-electron bonding.
2
Each methyl anion binds to three Li centers via 4-center-2-electron bonding.
3
It possesses a 2-center-2-electron bond.
4
Each methyl anion is terminally bound to each Li-centre.