chemistry

For each organic compound, determine if it is an alkane, alkene, or alkyne. (No ringed structures and only one multiple bond per structure.)
1. C10H18 - alkyne
2. C15H32 - alkane
3. C20H40 - alkyne
4. C5H10 - alkene
5. C3H6 - alkene
6. C7H16 - alkane
I am not sure on number 3

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asked by bekah
  1. #3 is an alkene.

    I don't know how you've been taught to do this but I do it this way.
    CnH2n+2 = alkane
    CnH2n = alkene (this is C20H40 and C5H10 as well as C3H6)
    CnH2n-2 = alkyne

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    posted by DrBob222

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