Confused about E-Z Isomerism Q9) - Butane

[influx]

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

 

[sjb-2812]

For 9 What do you understand by E / Z isomerism?

For 10 look into priorities for naming

 

[influx]

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]

OK, does this compound show E / Z isomerism?

 

[Borek]

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]

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]

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]

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]

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 :)