nonene
An alkyne with 9 carbon atoms is nonyne (C9H16).
The chemical compound C9H16 is known as nonene. It is an alkene with nine carbon atoms and sixteen hydrogen atoms in its molecular structure. Nonene is commonly used in the production of plastics and as a starting material for various chemical reactions.
A nonyne is nine Cs in a chain, with a triple bond at the beginning of the chain. So it would look like this: C---C-C-C-C-C-C-C-C All of the Cs have Hs, and the C on the left side has one H, the middle Cs each have two Hs, and the last C has three Hs. Hope this helps!