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Sagot :
For the given chemical structure, the group of protons that is the most shielded is A, the least shielded is D, the most downfield is D, and the most upfield is A.
The shielding effect refers to reduction in the effective nuclear charge on the electron cloud, which results in a difference in the attraction forces on the electrons in the atom. The electron density is said to shield the proton in the nucleus from the external magnetic field by decreasing the net magnetic field that is experiences. Hence, a shielded proton has circulating electron density that creates a magnetic field that opposes the applied magnetic field. In the given structure, the groups of protons that are most shielded is A as it experiences weaker magnetic field and the least shielded is D as it experiences stronger magnetic field. The group of protons that is most downfield is D and the most upfield is A as upfield and downfield refer to the low and high energy.
Note: The question is incomplete. The complete question probably is: For the chemical structure given below, identify the group of protons that is: a) the most shielded b) the least shielded c) the most downfield d) the most upfield.
Learn more about Shielding effect:
https://brainly.com/question/27985711
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