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The IUPAC name of
is :

  1. 6–Chloro–4–ethyl–5–methyl–5–hepten– 1–yne    
  2. 5–Methyl–4–ethyl–6–chloro–5–hepten– 1–yne    
  3. 6–Chloro–4–ethyl–5–methyl–1–hepten– 5–yne    
  4. 2–Chloro–4–ethyl–3–methyl–hept-2-ene-6-yne    

The correct answer is: 2–Chloro–4–ethyl–3–methyl–hept-2-ene-6-yne

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