Carbon chains exercises

Classify the main carbon chain of each compound (open/closed, saturated/unsaturated, normal/branched).

1. Butane (CH₃-CH₂-CH₂-CH₃)

Answer: open chain, saturated, normal (unbranched)

2. 2-methylpropane

Answer: open chain, saturated, branched

3. Cyclohexane

Answer: closed (cyclic) chain, saturated

4. But-1-ene

Answer: open chain, unsaturated (one double bond), normal