Question

Correct IUPAC nomenclature of the compound is:

• A. 3-Methylhex-5-en-1-yne
• B. 4-Methylhex-1-en-5-yne
• C. Hept-1-en-5-yne
• D. 4-Methylhex-5-en-1-yne

Answer 1

The correct option is B 4-Methylhex-1-en-5-yne

Numbering of the parent chain is done so as the principal functional group gets lowest locant. Here principal functional group is alkene and methyl substituent is present at 4th carbon.
Therefore naming according to alphabetical order, the correct name comes out to be 4-methylhex-1-en-5-yne.