Achiever Orgo #79

Started by snooper92
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snooper92

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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

Why is "E" the answer?
I thought it would be "B" because Cl is more electronegative than "I."