How can I draw alkynes?
You indicate the triple bond by three parallel lines between the two atoms, and the bond angle between the atoms attached to them should be 180 °.
Remember that he location of the triple bond is indicated by the number of the first carbon atom of the triple bond.
If the triple bond is at atom
For example, the structure of hex-3-yne is
Note that atoms 2, 3, 4, and 5 are in a straight line.
Atoms 2 and 5 are
Draw the structure of non-4-yne.
Draw atoms 3, 4, 5, and 6 in a straight line, with a triple bond between atoms and 4.
Add atoms 1, 2 and 7, 8, 9 as zig-zag lines to the skeleton structure.
And you have the structure of non-4-yne.