15. Analytical Techniques:IR, NMR, Mass Spect

How many signals are produced by each of the following compounds in its

b. ¹³C NMR spectrum?

2.

How many signals are produced by each of the following compounds in its

b. ¹³C NMR spectrum?

1.

How can 1,2-, 1,3-, and 1,4-dinitrobenzene be distinguished by

b. ¹³C NMR spectroscopy?

Sketch the following spectra that would be obtained for 2-chloroethanol:

d. The proton-coupled ¹³C NMR spectrum.

Sketch the following spectra that would be obtained for 2-chloroethanol:

c. The ¹³C NMR spectrum.

Compound A, with molecular formula C₄H₉Cl, shows two signals in its ¹³C NMR spectrum. Compound B, an isomer of compound A, shows four signals, and in the proton-coupled mode, the signal farthest downfield is a doublet. Identify compounds A and B.

Describe the proton-coupled ¹³C NMR spectra for compound 5 in Problem 41, indicating the relative positions of the signals.

5.

Answer the following questions for each compound:

a. How many signals are in its ¹³C NMR spectrum?

b. Which signal is at the lowest frequency?

9. CH₂=CHBr

Answer the following questions for each compound:

a. How many signals are in its ¹³C NMR spectrum? b. Which signal is at the lowest frequency?

7.

Answer the following questions for each compound:

a. How many signals are in its ¹³C NMR spectrum?

b. Which signal is at the lowest frequency?

8.

Describe the proton-coupled ¹³C NMR spectra for compound 1 in Problem 41, indicating the relative positions of the signals.

1. CH₃CH₂CH₂Br

Describe the proton-coupled ¹³C NMR spectra for compound 3 in Problem 41, indicating the relative positions of the signals.

3.

Identify each compound below from its molecular formula and its ¹³C NMR spectrum.

a. C₁₁H₂₂O

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Identify the compound with molecular formula C₇H₁₄O that gives the following proton-coupled ¹³C NMR spectrum:

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For the molecules in Assessment 15.58, give an approximate chemical shift for each indicated carbon. [The range of correct answers is large here.].

(a)