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E-Z isomerism

  1. May 12, 2012 #1
    ezfgf.png

    I know what E-Z isomerism is, but I'm confused about Q9), couldn't the answer just be all of them?

    FOr 10, I know its but- since there are 4 carbons in the chain but how do I know which of the options are wrong?

    Thanks
     
  2. jcsd
  3. May 12, 2012 #2
    For 9 What do you understand by E / Z isomerism?

    For 10 look into priorities for naming
     
  4. May 12, 2012 #3
    A compound is a z-isomer if the groups are on the same side, and an e-isomer if the groups are on different sides, like so:

    ez6.gif

    I tried look around but it gets too complicated, I do AS Chemistry which doesn't cover that much material..

    Thanks for the reply
     
  5. May 13, 2012 #4
    OK, does this compound show E / Z isomerism?

    200px-1%2C1-Dichloroethene.svg.png
     
    Last edited: May 13, 2012
  6. May 13, 2012 #5

    Borek

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    Staff: Mentor

    Other way of thinking (which basically boils down to the same thing sjb already suggests) - try to draw E-Z isomers of the compound A (Q9). Are they really different?
     
  7. May 13, 2012 #6
    Nope! Since the Cl and Cl have the same priority (and same goes for the H atoms)
     
  8. May 13, 2012 #7
    isoemr.png

    The one on the left is B - it does show E-Z isomerism so B is the answer (right?).

    Just out of curiosity, the one on the right is supposed to represent D, is it correct? Also how would I draw A and C?

    Cheers
     
  9. May 13, 2012 #8
    Looks good to me :)

    You'd draw A and C in a similar fashion, remembering that Carbon has a valence of 4 and Hydrogen 1. Each line represents a bond.
     
  10. May 14, 2012 #9
    Thanks :)
     
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