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Which set of protons in 1-bromo-5-fluoropentane has the smallest value for its chemical shift? It is...

Which set of protons in 1-bromo-5-fluoropentane has the smallest value for its chemical shift?

It is the protons on C-2
it is the protons on C-1
It is the protons on C-4
It is the protons on C-5
It is the protons on C-3
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