E-Z isomerism


by influx
Tags: isomerism
influx
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#1
May12-12, 03:49 PM
P: 73


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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sjb-2812
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#2
May12-12, 04:20 PM
P: 418
For 9 What do you understand by E / Z isomerism?

For 10 look into priorities for naming
influx
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#3
May12-12, 04:40 PM
P: 73
Quote Quote by sjb-2812 View Post
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:



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

Thanks for the reply

sjb-2812
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#4
May13-12, 05:09 AM
P: 418

E-Z isomerism


OK, does this compound show E / Z isomerism?

Borek
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#5
May13-12, 06:11 AM
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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?
influx
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#6
May13-12, 07:12 AM
P: 73
Quote Quote by sjb-2812 View Post
OK, does this compound show E / Z isomerism?

Nope! Since the Cl and Cl have the same priority (and same goes for the H atoms)
influx
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#7
May13-12, 07:19 AM
P: 73


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
sjb-2812
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#8
May13-12, 11:30 AM
P: 418
Quote Quote by influx View Post


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.
influx
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#9
May14-12, 12:13 PM
P: 73
Quote Quote by sjb-2812 View Post
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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