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15. Analytical Techniques:IR, NMR, Mass Spect

1H NMR:Number of Signals

15. Analytical Techniques:IR, NMR, Mass Spect

1H NMR:Number of Signals

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General Assumption for 1H NMR Signals

General Assumption for 1H NMR Signals

Johnny Betancourt

Identifying Proton Signals

Identifying Proton Signals

Johnny Betancourt

Identifying Proton Signals

Identifying Proton Signals

Johnny Betancourt

Identifying Proton Signals

Identifying Proton Signals

Johnny Betancourt

Practice this topic

Multiple Choice

How many types of electrically unique protons (peaks) are there in the following molecule?

Multiple Choice

How many types of electrically unique protons (peaks) are there in the following molecule?

Multiple Choice

How many types of electrically unique protons (peaks) are there in the following molecule?

Multiple Choice

How many types of electrically unique protons (peaks) are there in the following molecule?

Multiple Choice

How many types of electrically unique protons (peaks) are there in the following molecule?

Multiple Choice

How many types of electrically unique protons (peaks) are there in the following molecule?

Multiple Choice

How many signals would be expected in a ¹H NMR spectrum of the following molecule?

Textbook Question

Determine the number of different kinds of protons in each compound. (a) 1-chloropropane (b) 2-chloropropane (c) 2,2-dimethylbutane

Textbook Question

How many signals would you expect to see in the 1H NMR spectrum of each of the following compounds? a. b.

Textbook Question

How many signals would you expect to see in the 1H NMR spectrum of each of the following compounds? g. h.

Textbook Question

How can 1H NMR distinguish between the compounds in each of the following pairs? g.

Textbook Question

How many signals are produced by each of the following compounds in its a. 1H NMR spectrum? 4.

Textbook Question

How can 1H NMR be used to prove that the addition of HBr to propene follows the rule that says that the electrophile adds to the sp2 carbon bonded to the most hydrogens?

Textbook Question

How many signals are produced by each of the following compounds in its a. 1H NMR spectrum? 4.

Textbook Question

Draw an isomer of dichlorocyclopropane that gives an 1H NMR spectrum c. with three signals

Textbook Question

How many signals would you expect to see in the 1H NMR spectrum of each of the following compounds? m.

Textbook Question

How many signals would you expect to see in the 1H NMR spectrum of each of the following compounds? e.

Textbook Question

How many signals would you expect to see in the 1H NMR spectrum of each of the five compounds with molecular formula C6H14?

Textbook Question

How many sets of equivalent hydrogens are in each molecule shown? (a)

Textbook Question

How many sets of equivalent hydrogens are in each molecule shown? (b)

Textbook Question

How many sets of equivalent hydrogens are in each molecule shown? (c)

Textbook Question

How many unique ¹H NMR signals would you expect in an NMR spectrum for the following molecules? (a)

Textbook Question

How many unique ¹H NMR signals would you expect in an NMR spectrum for the following molecules? (b)

Textbook Question

How many unique ¹H NMR signals would you expect in an NMR spectrum for the following molecules? (c)

Textbook Question

How many sets of equivalent hydrogens are present in the molecule that resulted in this NMR spectrum? [Recall that some signals can be split into multiple peaks—they are still just one signal.]

Textbook Question

Without worrying about the relative location of the signals (i.e., the chemical shift) or the splitting patterns, draw a spectrum of the following molecule. Be sure to label each signal based on the set of equivalent hydrogens to which it corresponds. [We expand on this question in future assessments.]

Textbook Question

Replace Hₐ and H₆ in hexane with a deuterium. What is the relationship between the two products you obtain? Based on this, would you expect the two hydrogens to give one or two signals in the ¹H NMR spectrum?

Textbook Question

(•) How many distinct signals would you expect to see in the ¹H NMR spectrum of the following molecules? [Ignore diastereotopic hydrogens for the sake of this assessment.] (a)

Textbook Question

(•) How many distinct signals would you expect to see in the ¹H NMR spectrum of the following molecules? [Ignore diastereotopic hydrogens for the sake of this assessment.] (b)

Textbook Question

(•) How many distinct signals would you expect to see in the ¹H NMR spectrum of the following molecules? [Ignore diastereotopic hydrogens for the sake of this assessment.] (c)

Textbook Question

(•) How many distinct signals would you expect to see in the ¹H NMR spectrum of the following molecules? [Ignore diastereotopic hydrogens for the sake of this assessment.] (f)

Textbook Question

Radical chlorination, a reaction studied in Chapters 5 and 11, replaces a hydrogen with a chlorine. Assuming there is no regioselectivity (all hydrogens can react equally), how many different chloroalkanes are possible upon reaction of each alkane with one equivalent of Cl₂

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