Use VSEPR theory to predict the molecular geometry around either carbon atom in acetylene, C2H2.

The Answer is linear. How do you figure out the answer is linear? I know you draw the lewis structure but when I drew it I thought the answer would be tetrahedral, because the carbon atom has 4 lone pairs around it??

2 answers

it has two carbon atoms, not one. Carbons have a triple bond between them

H-C≡C-H where * means a triple bond.
I don't know how Bob Pursley drew a triple bond (and I think the * means he doesn't know he did, either). That's great if we knew how to do it.