Question

An anisotropy causes shielding in which of the following molecules?
ID: 1171917466, NOTE: SCREENSHOT PROHIBITED
O
A
ID: 1171917466
A. Acetaldehyde
ID: 1171917466
B
B. Benzene
ID: 1171917466
С
C. Ethylene
ID: 1171917466
D
D. Acetylene​

Answer 1

Answer:

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Explanation:

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Answer 2

Acetylene is the molecule experiencing shielding.

What is diamagnetic anisotropy?

When exposed to an external magnetic field, the pi electrons produce their own magnetic field, which results in the phenomenon known as diamagnetic anisotropy. Pi electrons act differently than sigma electrons since they aren't held as tightly together.

A linear acetylene or ethyne molecule is oriented in parallel to the external magnetic field. The ring current of pi electrons is opposite direction to applied magnetic field Thus, the acetylenic protons experience less magnetic field than the applied. Therefore, they are shielded and the value shifts towards a higher field (2-3 ppm). Thus, correct answer is acetylene.

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