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Chapter 14: Q.21558-14-14P. (page 546)

Into how many peaks will each proton shown in green be split?

a.

b.

c.

d.

e.

f.

Short Answer

Expert verified

a. 3 and 4

b. 2 and 4

c. 1, 3, and 3

d. 2 and 2

e. 2 and 2

f. 2 and 3

Step by step solution

01

Chemical equivalence and the number of signals

All the protons in identical chemical environments and hence have the same shielding constants are said to be chemically equivalent. They will give rise to only one absorption line in the NMR spectrum. Each chemically different kind of proton will have different peaks.

02

Determination of splitting pattern for a molecule

* Determine the number of different kinds of protons.

* non-equivalent protons on the same carbon or adjacent carbon atoms will split each other

* then apply the n +1 rule.

03

Finding the number of peaks into which each proton will split

Structural formula of a

Ha has three peaks, and the splitting is triplet as the neighboring carbon has two hydrogen atoms.

Hb has four peaks, and the splitting is quartet as the neighboring carbon has three hydrogen atoms.

Structural formula of b

Ha has two peaks, and the splitting is doublet as the neighboring carbon has one hydrogen atom.

Hb has four peaks, and the splitting is quartet as the neighboring carbon has three hydrogen atoms.

Structural formula of c

Ha has one peak, and the splitting is singlet as the neighboring carbon has no hydrogen atom.

Hb has three peaks, and the splitting is triplet as the neighboring carbon has two hydrogen atoms.

Hc has three peaks, and the splitting is triplet as the neighboring carbon has two hydrogen atoms.

Structural formula of d

Hahas two peaks, and the splitting is doublet as the neighboring carbon has two hydrogen atoms.

Hb has two peaks, and the splitting is doublet as the neighboring carbon has two hydrogen atoms.

Structural formula of e

Hahas two peaks, and the splitting is doublet as the neighboring carbon has two hydrogen atoms.

Hbhas two peaks, and the splitting is doublet as the neighboring carbon has two hydrogen atoms.

Structural formula of f

Hahas two peaks, and the splitting is doublet as the neighboring carbon has two hydrogen atoms.

Hbhas three peaks, and the splitting is triplet as the neighboring carbon has two hydrogen atoms.

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Most popular questions from this chapter

Into how many peaks will the signal for each of the labeled protons be split?

a.

b.

c.

d.

e.

f.

g.

h.

i.

j.

Question: What effect does increasing the operating frequency of a1HNMR spectrum have on each value: (a) the chemical shift inδ ;(b) the frequency of an absorption in Hz; (c) the magnitude of a coupling constant J in Hz?

Question: (a) How many 1H NMR signals does each of the following compounds exhibit? (b) How many 13C NMR signals does each compound exhibit?

a. How many signals does dimethyl fumarate (\({\bf{C}}{{\bf{H}}_{\bf{3}}}{{\bf{O}}_{\bf{2}}}{\bf{CCH = CHC}}{{\bf{O}}_{\bf{2}}}{\bf{C}}{{\bf{H}}_{\bf{3}}}\) with a trans C=C) exhibit in its \(^{{\bf{13}}}{\bf{C}}\) NMR spectrum?

b. Draw the structure of an isomer of dimethyl fumarate that has each of the following number of signals in its \(^{{\bf{13}}}{\bf{C}}\) NMR spectrum:\(\left( {\bf{1}} \right)\) three; \(\left( {\bf{2}} \right)\) four; \(\left( {\bf{5}} \right)\) five

Question: What splitting pattern is observed for each proton in the following compounds?

a.

b.
See all solutions

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