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ChemistryOrganic Chemistry

Which of the Following Represents an Internal Alkyne? Terminal and Internal Alkynes Compared

Classifying 1-hexyne, 3-octyne, cyclooctyne and propyne shows that 3-octyne and cyclooctyne are internal alkynes: their triple-bond carbons are bonded to carbon on both sides, with no hydrogen on either sp carbon.

Question

Classify each of the following as an internal or a terminal alkyne:(a) 1-hexyne(b) 3-octyne(c) cyclooctyne(d) propyne

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Evidence boundary

This answer classifies the four alkynes transcribed in the prompt as terminal or internal on the basis of their structures. It does not predict reactions, compare stability or acidity in numerical terms, or discuss naming rules beyond the position of the triple bond.