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How many open-chain (acyclic) structural isomers exist for a hydrocarbon with the molecular formula — Hydrocarbons Chemistry Question

Question

How many open-chain (acyclic) structural isomers exist for a hydrocarbon with the molecular formula $C_4H_6$?

Answer: A

💡 Solution & Explanation

$C_4H_6$ has a Degree of Unsaturation of 2. Acyclic isomers can be alkynes or alkadienes: but-1-yne, but-2-yne, buta-1,3-diene, and buta-1,2-diene. Total = 4.

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