What is the correct IUPAC name for the molecule shown below?
A)2,2,3-Trimethyl-4-hexyne
B)4-tert-Butyl-2-pentyne
C)4,5,5-Trimethyl-2-hexyne
D)4,5,5,5-Tetramethyl-2-pentyne
E)2,2-Dimethyl-3-(1-propynyl)butane

Question

What is the correct IUPAC name for the molecule shown below? 
A)2,2,3-Trimethyl-4-hexyne 
B)4-tert-Butyl-2-pentyne 
C)4,5,5-Trimethyl-2-hexyne 
D)4,5,5,5-Tetramethyl-2-pentyne 
E)2,2-Dimethyl-3-(1-propynyl)butane

Quizplus · Accepted Answer

The longest carbon chain in the molecule contains six carbons, making it a hexyne. The triple bond is between carbons 2 and 3 (starting from the left), so it is a 2-hexyne. The substituents are two methyl groups on carbon 4 and one methyl group on carbon 5, making it 4,5,5-trimethyl-2-hexyne. Therefore, choice C is the correct IUPAC name for the molecule.

What Is the Correct IUPAC Name for the Molecule Shown