## Chemistry: A Molecular Approach (3rd Edition)

The name of the alkyne is $4,5-dimethyl-2-heptyne$.
The longest carbon chain has 7 carbon atoms (hept-). There are two methyl substituents, one each at positions 4 and 5. The triple bond is at position 2. Hence, the name of the alkyne is $4,5-dimethyl-2-heptyne.$