Question 79, Achiever Test 1

[JNew]

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The question about which compound would have NMR signal most downfield:
The answer was Ch3I3.
Why would that be more downfield than Ch3Cl3 if the most downfield signal is usually the one closest to the most electronegative element, namely Ch3Cl3.
Any help would be appreciated!

 

[Mstoothlady2012]

ch3cl3 is not even a right formula may be thats y....i guess they are just trying to trick you

 

[JNew]

Good Point!

 

[Mstoothlady2012]

Good Point!

haha yea! achiever is stupid

 

[OneSmileDDS]

The question about which compound would have NMR signal most downfield:
The answer was Ch3I3.
Why would that be more downfield than Ch3Cl3 if the most downfield signal is usually the one closest to the most electronegative element, namely Ch3Cl3.
Any help would be appreciated!

Ch3Cl3 is tri-iodo ethane. The second C is attached to three iodines and the first C next to it. There is no H attached here. The only H's you have are those 3 hydrogens attached to the first C, which when compared to Ch3I3, is further away from electronegative elements.

Hope you gus get the point here.😉

 

[Mstoothlady2012]

oh ok! it looks like chlorine...oops

 

[JNew]

ya, i thought that it was a cl too!