Question 1

Which compound would produce the given 1H NMR spectrum below?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V B

Question 2

Explain how you can use a mass spectrum to determine if a single chlorine is present in a molecule.

Accepted Answer

If chlorine is present in a molecule,the M + 2 peak is about one-third the intensity of the M⁺ peak.

Question 3

The mass spectrum for an unknown molecule has an MF1F1F1S1F1F1F10 peak with a relative intensity of 50 and an M F1F1F1S1F1F1F10 1 peak with a relative intensity of 1.65.How many carbons are in the unknown molecule?

Accepted Answer

A) One carbon 
B) Two carbons 
C) Three carbons 
D) Four carbons 
E) Six carbons 
A) One carbon 
B) Two carbons 
C) Three carbons 
D) Four carbons 
E) Six carbons C

Question 4

Is a chlorine or a bromine present in the molecule responsible for the following mass spectrum? Explain how you know.

Accepted Answer

A CHLORINE IS PRESEN

Question 5

Which proton in the following molecule has the greatest chemical shift?

Accepted Answer

The answer of Which proton in the following molecule has...

Question 6

What is the expected splitting pattern for the indicated hydrogen?

Accepted Answer

The answer of What is the expected splitting pattern for...

Question 7

For the following molecule,give the splitting patterns for HA,HB,and HC.

Accepted Answer

H_A is a triplet,H_B is

Question 8

How many distinct 13C NMR signals are expected for the following compound?

Accepted Answer

Question 9

Give the expected splitting pattern for the indicated hydrogen.

Accepted Answer

The answer of Give the expected splitting pattern for the...

Question 10

Label the base peak and the MF1F1F1S1F1F1F10 peak in the following mass spectrum.

Accepted Answer

Question 11

What is the expected splitting pattern for the indicated hydrogen?

Accepted Answer

A) Singlet 
B) Doublet 
C) Triplet 
D) Quartet 
E) Quintet 
A) Singlet 
B) Doublet 
C) Triplet 
D) Quartet 
E) Quintet

Question 12

A molecule has the formula C4H9Cl,and its 1H NMR spectrum has only one singlet at 1.49 ppm.Give the structure of this molecule.

Accepted Answer

Question 13

The mass spectrum for an unknown molecule has an M+ peak with a relative intensity of 100 and an M + 1 peak with a relative intensity of 9.905.How many carbons are in the unknown molecule?

Accepted Answer

A) 1 carbon 
B) 5 carbons 
C) 9 carbons 
D) 10 carbons 
E) 100 carbons 
A) 1 carbon 
B) 5 carbons 
C) 9 carbons 
D) 10 carbons 
E) 100 carbons

Question 14

What is the relative ratio of hydrogens in the following molecule?

Accepted Answer

A) 3:3:1:2:2:2:1:3:3 
B) 6:1:2:1 
C) 6:1:2:2:2:1:6 
D) 12:2:2:2:2 
E) None (a-d) give the correct relative ratio of hydrogens. 
A) 3:3:1:2:2:2:1:3:3 
B) 6:1:2:1 
C) 6:1:2:2:2:1:6 
D) 12:2:2:2:2 
E) None (a-d) give the correct relative ratio of hydrogens.

Question 15

How many chemically distinct hydrogen atoms are in the following molecule?

Accepted Answer

A) Two types 
B) Three types 
C) Four types 
D) Five types 
E) Six types 
A) Two types 
B) Three types 
C) Four types 
D) Five types 
E) Six types

Question 16

Which compound would produce the 1H NMR spectrum below?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 17

HA splits the 1H NMR signal for HB by 7.4 Hz.By how much does HB split the 1H NMR signal for HA?

Accepted Answer

A) 0 Hz 
B) 3.7 Hz 
C) 7.4 Hz 
D) 14.8 Hz 
E) Not enough information to answer 
A) 0 Hz 
B) 3.7 Hz 
C) 7.4 Hz 
D) 14.8 Hz 
E) Not enough information to answer

Question 18

Which compound has four distinct signals in its 13C NMR spectrum?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 19

Which molecule will have the greatest coupling constant between HA and HB?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 20

Sketch a predicted 1H NMR spectrum for the following molecule.

Accepted Answer

Exam 18: Structure Determination 2: Nuclear Magnetic Resonance Spectroscopy and Mass Spectrometry

Which compound would produce the given 1H NMR spectrum below?

Explain how you can use a mass spectrum to determine if a single chlorine is present in a molecule.

The mass spectrum for an unknown molecule has an M peak with a relative intensity of 50 and an M  1 peak with a relative intensity of 1.65.How many carbons are in the unknown molecule?

Is a chlorine or a bromine present in the molecule responsible for the following mass spectrum? Explain how you know.

Which proton in the following molecule has the greatest chemical shift?

What is the expected splitting pattern for the indicated hydrogen?

For the following molecule,give the splitting patterns for HA,HB,and HC.

How many distinct 13C NMR signals are expected for the following compound?

Give the expected splitting pattern for the indicated hydrogen.

Label the base peak and the M peak in the following mass spectrum.

What is the expected splitting pattern for the indicated hydrogen?

A molecule has the formula C4H9Cl,and its 1H NMR spectrum has only one singlet at 1.49 ppm.Give the structure of this molecule.

The mass spectrum for an unknown molecule has an M+ peak with a relative intensity of 100 and an M + 1 peak with a relative intensity of 9.905.How many carbons are in the unknown molecule?

What is the relative ratio of hydrogens in the following molecule?

How many chemically distinct hydrogen atoms are in the following molecule?

Which compound would produce the 1H NMR spectrum below?

HA splits the 1H NMR signal for HB by 7.4 Hz.By how much does HB split the 1H NMR signal for HA?

Which compound has four distinct signals in its 13C NMR spectrum?

Which molecule will have the greatest coupling constant between HA and HB?

Sketch a predicted 1H NMR spectrum for the following molecule.

Atomic and Molecular Structure

Interchapter: Nomenclature 1-4

Interchapter 1molecular Orbital Theory and Chemical Reactions

Three-Dimensional Geometry,intermolecular Interactions,and Physical Properties

Orbital Interactions 1: Hybridization and Two-Center Molecular Orbitals

Isomerism 1: Conformational and Constitutional Isomers

Isomerism 2: Chirality,enantiomers,and Diastereomers

The Proton Transfer Reaction: an Introduction to Mechanisms,thermodynamics,and Charge Stability

An Overview of the Most Common Elementary Steps

An Introduction to Multistep Mechanisms: Sn1 and E1 Reactions

Nucleophilic Substitution and Elimination Reactions 1: Competition Among Sn2,sn1,e2,and E1 Reactions

Nucleophilic Substitution and Elimination Reactions 2: Reactions That Are Useful for Synthesis

Electrophilic Addition to Nonpolar Π Bonds 1: Addition of a Brønsted Acid

Electrophilic Addition to Nonpolar Π Bonds 2: Reactions Involving Cyclic Transition States

Organic Synthesis 1: Beginning Concepts

Orbital Interactions 2: Extended Π Systems,conjugation,and Aromaticity

Structure Determination 1: Ultravioletvisible and Infrared Spectroscopies

Nucleophilic Addition to Polar Π Bonds 1: Addition of Strong Nucleophiles

Nucleophilic Addition to Polar Π Bonds 2: Addition of Weak Nucleophiles and Acid and Base Catalysis

Organic Synthesis 2: Intermediate Topics in Synthesis Design,and Useful Reduction and Oxidation Reactions

Nucleophilic Additionelimination Reactions 1: the General Mechanism Involving Strong Nucleophiles

Nucleophilic Additionelimination Reactions 2: Weak Nucleophiles

Electrophilic Aromatic Substitution 1: Substitution on Benzene; Useful Accompanying Reactions

Electrophilic Aromatic Substitution 2: Substitution on Mono- and Disubstituted Benzene and Other Aromatic Rings

The Dielsalder Reaction and Other Pericyclic Reactions

Reactions Involving Free Radicals

Polymers

Filters

Which compound would produce the given ¹H NMR spectrum below?

The mass spectrum for an unknown molecule has an M^ peak with a relative intensity of 50 and an M  1 peak with a relative intensity of 1.65.How many carbons are in the unknown molecule?

For the following molecule,give the splitting patterns for H_A,H_B,and H_C.

How many distinct ¹³C NMR signals are expected for the following compound?

Label the base peak and the M^ peak in the following mass spectrum.

A molecule has the formula C₄H₉Cl,and its ¹H NMR spectrum has only one singlet at 1.49 ppm.Give the structure of this molecule.

The mass spectrum for an unknown molecule has an M⁺ peak with a relative intensity of 100 and an M + 1 peak with a relative intensity of 9.905.How many carbons are in the unknown molecule?

Which compound would produce the ¹H NMR spectrum below?

H_A splits the ¹H NMR signal for H_B by 7.4 Hz.By how much does H_B split the ¹H NMR signal for H_A?

Which compound has four distinct signals in its ¹³C NMR spectrum?

Which molecule will have the greatest coupling constant between H_A and H_B?

Sketch a predicted ¹H NMR spectrum for the following molecule.