Which material is structurally distinct: graphite; silicon dioxide; or propane?

1 Answer
Dec 8, 2015

Graphite!

Explanation:

Graphite is a non-molecular structure, that features C-CCC bond angles of 120""^@120. While there are 120""^@120 bonds in acetic acid, there are 2 rather than 3 such bonds. Propane and silicon dioxide are base on tetrahedra. Of course propane is MOLECULAR, whereas the other materials are NON-MOLECULAR.