Question

What is the HOMO for C2

Answer 1

The molecular orbital diagram for C2

This, of course, implies that a C

2

 molecule has a total of

2×6 e =12 e

C2 :(1sσ)2(1s*σ)2(2sσ)2(2s*σ)2(2pπ)4

(2pπ)4 is the HOMO for C2