Question

what is the name of a hydrocarbon that has the formula ch₃(ch₂)₄cch?
6 - heptyne
1 - heptene
1 - heptyne
6 - heptene

Explanation:

The formula $CH_3(CH_2)_4CCH$ has a triple - bond ($C\equiv C$) which indicates it is an alkyne. The parent chain has 7 carbon atoms (hept -). The triple - bond is at the first carbon atom when numbering the chain from the end closest to the triple - bond. So, it is 1 - heptyne.

Answer:

C. 1 - heptyne