When naming hydrocarbons, what does the suffix –yne indicate about the structure of the molecule?

Give a systematic name for this molecule.

Draw a structure for 4-ethyl-7-phenyl-2-heptyne.

What is the correct name of the compound that is incorrectly named 1-chloro-3-pentyne?

3,6‑diethyl‑2,8‑dimethyl‑4‑decyne

What is the name for this molecule? 3-heptyne 3-heptene 3-hexyne 3-hexene

What is the name for this molecule? nonene nonane 1-octyne 1-octene

Ignoring the possibility of stereoisomers, what is the IUPAC name of the following substance?

Draw the correct structure for each compound. a. 4-octyne b. 3-nonene