Which of the following straight-chain hydrocarbons is classified as saturated?
  1. C2H4
  2. C4H8
  3. C4H6
  4. C5H10
  5. C2H6
Explanation
Answer: C2H6

Saturated straight-chain hydrocarbons contain only single bonds. As long as the saturated hydrocarbon does not contain a ring, it will obey the formula CnH2n+2. Thus, the saturated straight-chain hydrocarbon is C2H6.
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