Label each proton with the predicted splitting pattern it would exhibit in a 1H NMR spectrum.

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Concepts and reason

oIn the nuclear magnetic resonance spectroscopy, the number of nonequivalent protons present in the structure can be identified with the help of proton NMR.

oThe resonance frequency is observed in reference to the standard compound (0 ppm) and is represented as the chemical shift and is measured in ppm.

oIn ¹H NMR, the splitting gives the information about number of neighboring hydrogen present for the particular hydrogen or two or more equivalent hydrogen present.

Fundamentals

In ¹H NMR, the splitting can be calculated byrule where, n represents the number of neighboring hydrogens present in the structure.

Example:

In the above structure, carbon that is marked with (a) has hydrogen – 2 and carbon that is marked with (b) has hydrogen – 3 and carbon that is marked with (c) has hydrogen – 3. There are no neighboring hydrogens for (a) that is 3, (b) that is 2 and c Therefore, the rule is as follows:

splitting of a = (3+1)
splitting of a = 4(quartet)
splitting of b = (2+1)
splitting of b = 3(triplet)
splitting of c = (0+1)

protons	Neighboring protons
a	2
b, c	1
d, e, f	0

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Answer 2

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Label each proton with the predicted splitting pattern it would exhibit in a 1H NMR spectrum.

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