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The IUPAC name of the following compound is :

1. 4 - Hydroxyhept - 6 - en - 1 - yne
2. Hept - 6 - en - 1 - yn - 4 - ol
3. 4 - Hydroxyhept - 1 - en - 6 - yne
4. Hept - 1 - en - 6 - yn - 4 - ol

Correct answer: Hept - 1 - en - 6 - yn - 4 - ol

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