What is the IUPAC name for the molecule shown below?
A) 4,4-dimethyl-2-pentyne
B) 2,2-dimethyl-4-heptyne
C) 1-tert-butyl-3-heptyne
D) 6,6-dimethyl-3-heptyne
E) 6,6,6-trimethyl-3-hexyne

Question

What is the IUPAC name for the molecule shown below? 
A) 4,4-dimethyl-2-pentyne 
B) 2,2-dimethyl-4-heptyne 
C) 1-tert-butyl-3-heptyne 
D) 6,6-dimethyl-3-heptyne 
E) 6,6,6-trimethyl-3-hexyne

Quizplus · Accepted Answer

The longest chain of carbons in the molecule is 7, so it is a heptyne. The triple bond starts at the third carbon from the left, so we number the carbons accordingly. The molecule has two methyl groups on each end of the triple bond, so the name is 6,6-dimethyl-3-heptyne.

What Is the IUPAC Name for the Molecule Shown Below