achiever o chem

[utdent20]

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Which of the following compounds will have its proton(s) shifted furthest and downfield on a 200 MHz 1H NMR spectrum?
A. CH3CH3 B. CH3CI3 C. CH3I D. CH2I2 E. CHI3



Can anyone try to explain the HNMR Spectrum, ? C is not the right answer.

 

[Orgodox]

Its E. Only one proton in E so it feels it more than spreading it over 3 in C plus 3X more effect in E since it has 3I not 1I