What is the correct IUPAC name of above compound ?

Options

A. 2-hexen-5-yne
B. 4-hexen-1-yne
C. 5-hexyn-2-ene
D. 1-hexyn-4-ene

Answer

B

Explanation

The functional groups (alkene and alkyne) reportedly have equal priority: (1) In a molecule with both double and triple bonds, whichever is nearer to the end of the chain determines the direction of numbering. (2) In the case where each has the same position number, the double bond takes the lower number. In the name, "ene" comes before "yne" because of alphabetization.
4-hexen-1-yne preference goes to locant position (triple bond is at lower number) and not to the alphabetical order or anything else of the locants.