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The IUPAC name of the compound having the formula CH ≡ C − CH = CH2 is:

1. 1-butyn-3-ene
2. but-1-yne-3-ene
3. 1-butene-3-yne
4. 3-butene-1-yne

Correct answer: 1-butene-3-yne

Solution

The compound has both a triple bond and a double bond. According to IUPAC rules, the chain is numbered to give the triple bond the lowest possible number. Thus, the correct name is 1-butene-3-yne.

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