Orgo question

[Gasedo]

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Which of the following compounds will have its proton(s) shifted furthest and downfield on a 200 M NMR spectrum?

A CH3CH3
B CH3Cl3
C CH3I
D CH2I2
E CHI3

The answer is E, but can somebody elaborate on this, please?

 

[dat_student]

Which of the following compounds will have its proton(s) shifted furthest and downfield on a 200 M NMR spectrum?

A CH3CH3
B CH3Cl3
C CH3I
D CH2I2
E CHI3

The answer is E, but can somebody elaborate on this, please?

E. 3 electron withdrawing atoms (3 Is) and one H

 

[Gasedo]

E. 3 electron withdrawing atoms (3 Is) and one H

OK, so if the question would be which compound will have its proton(s) shifted furthest and upfield do we need to check on the compound with the most electron donating atoms?

 

[DrTacoElf]

Yes. The only exception to these "rules" is if the vectors cancel out. Remember the resultant overall summation is what matters.

i.e carbon tetracholride has a shift of 0.