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What are the molecular formulas of the second and fourth members of the series with the general formula CnH2n?

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Solution

The general formula given is for a series of hydrocarbons known as alkenes. The general formula for alkenes is CnH2n, where n is the number of carbon atoms.

  1. The second member of this series would have n=2. Substituting n=2 into the formula CnH2n gives C2H4.

  2. The fourth member of this series would have n=4. Substituting n=4 into the formula CnH2n gives C4H8.

So, the molecular formulas of the second and fourth members of the series are C2H4 and C4H8, respectively.

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