Which of the following is a saturated hydrocarbon?

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Definition: A saturated hydrocarbon contains only single C–C bonds. Acyclic saturated hydrocarbons (alkanes) follow the formula $C_nH_{2n+2}$. Evaluate each option:

1. $C_3H_8$: For $n=3$, $2n+2=2	imes3+2=8$, so $C_3H_8$ fits $C_nH_{2n+2}$ → propane, an alkane (only single bonds) → saturated.

2. $C_6H_6$: Benzene, contains delocalized pi bonds (unsaturated/aromatic).

3. $C_2H_4$: Ethene, contains a C=C double bond → unsaturated.

4. $C_4H_8$: Formula $C_nH_{2n}$ corresponds to alkenes (or cycloalkanes). It can be an alkene (unsaturated) or a cycloalkane (saturated), so the formula alone is ambiguous.

Conclusion: The unambiguous saturated hydrocarbon given is $C_3H_8$ (option 1). FINAL_ANSWER: a

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