The IUPAC Name of the compound

CH₃ – CH = CH – C ≡ CH is

CONCEPT:

Nomenclature of Alkenes and Alkynes

• The IUPAC nomenclature system is a standardized method for naming chemical compounds.
• When naming compounds with both double (alkene) and triple (alkyne) bonds, certain rules must be followed:
  • Identify the longest continuous carbon chain that contains both the double and triple bonds.
  • Number the chain from the end nearest to the first multiple bond (double or triple).
  • Indicate the positions of the double and triple bonds using the appropriate locants (numbers).
  • Write the name as a single word with the position and type of the bonds in the format: [prefix] - [locant]-[alken]-[locant]-[yne].

EXPLANATION:

• For the compound CH₃-CH=CH-C≡CH:
  • The longest carbon chain containing both the double and triple bonds has 5 carbons.
  • Numbering from the end closest to the first multiple bond gives the locants as follows:
    • Double bond (C=C) between C-2 and C-3.
    • Triple bond (C≡C) between C-4 and C-5.
  • Combining the locants with the root name "pent" (for 5 carbons) results in the name: Pent-3-en-1-yne.

Therefore, the correct IUPAC name of the compound CH₃-CH=CH-C≡CH is Pent-3-en-1-yne.