Lewis Structure for C2H2
The Lewis structure for Ethyne (C2H2), also known as acetylene, is drawn by placing the two carbon atoms in the center and linking them with a triple bond. Each carbon atom is then bonded to one hydrogen atom. Here’s how it looks:
H H \ / C ≡ C
A. Electron Pair Geometry around the Central Atom
In C2H2, there are two central atoms (the carbon atoms). Each carbon atom is bonded to one hydrogen atom and is involved in a triple bond with the other carbon atom. The electron pair geometry around each carbon atom is linear because there are two bonding groups (the triple bond with the other carbon and the single bond with hydrogen) and no lone pairs.
B. Molecular Geometry around the Central Atom
The molecular geometry around each carbon atom is also linear. This is due to the same reasons stated above; both the bonding pairs are aligned, resulting in a straight-line shape.
C. Bond Angles around the Central Atom
The bond angles around each carbon atom in C2H2 are 180 degrees. This is typical for a linear arrangement where the bonds are positioned opposite each other.