I am taking an Organic Chemistry class in my college and I was wondering what the Molecular Formula for CH3-C≡C-CH2-CH3 was.

It would also be nice to have the class of compound.

  • $\begingroup$ Seems like 2-Pentene en.wikipedia.org/wiki/Pentene $\endgroup$
    – sigrlami
    Jun 25 '13 at 16:46
  • $\begingroup$ @RyanArmstrong, 2-pentene is not the correct name for this compound. The triple-bond makes it an alkyne, not an alkene. Jerry has correctly identified the compound in his answer below as 2-pentyne/pent-2-yne. $\endgroup$
    – Greg E.
    Jun 25 '13 at 17:40

Are you sure you didn't mean the name of this molecule? Because strictly speaking, the molecular formula of the molecule you posted would be $\ce{C5H8}$. Pent-2-ene has molecular formula $\ce{C5H10}$.

The molecule you asked about has a triple bond, meaning that it's an alkyne and in this case, pent-2-yne. If you want the wiki page, it's here.

Count the number of carbon atoms and the number of hydrogen atoms to be sure.


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