Practice question
Question
A hydrocarbon with a degree of unsaturation of 2 produces 4 moles of CO₂ per mole upon complete combustion. What is its molecular formula?
Explanation
4 carbons (from 4 CO₂). Degree of unsaturation = 2 suggests two double bonds or one triple bond. CH₃C≡CCH₃ (but-2-yne, C₄H₆) fits with 2 π, 8 σ, and 4 CO₂.
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