Confused about E-Z Isomerism Q9) - Butane

  • #1
influx
164
2
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
 
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  • #2
For 9 What do you understand by E / Z isomerism?

For 10 look into priorities for naming
 
  • #3
sjb-2812 said:
For 9 What do you understand by E / Z isomerism?

For 10 look into priorities for naming

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
 
  • #4
OK, does this compound show E / Z isomerism?

200px-1%2C1-Dichloroethene.svg.png
 
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  • #5
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?
 
  • #6
sjb-2812 said:
OK, does this compound show E / Z isomerism?

200px-1%2C1-Dichloroethene.svg.png

Nope! Since the Cl and Cl have the same priority (and same goes for the H atoms)
 
  • #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
 
  • #8
influx said:
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

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.
 
  • #9
sjb-2812 said:
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.

Thanks :)
 
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