How many alkyne isomers are possible for a formula of #C_6H_10# for which the unsaturated is INTERNAL?

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Answer 1 · 2017-08-09T06:47:55

Well, I count three.........

There are #"(i), 3-hexyne"#, #"(ii), 2-hexyne"#, and #"(iii), 4-methyl-2-pentyne"#...................... Are there any more?

Answer 2 · 2017-08-09T14:23:25

I count three distinct internal alkynes with molecular formula #"C"_6"H"_10#.

With a six-carbon chain

(a) Hex-2-yne

Hex-2-yne

(b) Hex-3-yne

Hex-3-yne

With a five-carbon chain

(c) 4-Methylpent-2-yne

4-Methylpent-2-yne