(a) Interpretation: The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated. Concept introduction: Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as ( M + 1 ) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

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Answer 1

Question

Chapter 12, Problem 12.18P

Interpretation Introduction

(a)

Interpretation:

The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(b)

Interpretation:

The mechanism for the fragmentation of the bond between two methylene group is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(c)

Interpretation:

The structure of the fragment ion of 2, 2, 5, 5-tetramethylhexane at m/z=71 is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

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The base peak in the mass spectrum of 2,2,5,5-tetramethylhexane (molecular mass = 142) is at m/z = 57, which corresponds to a composition of C4H9. Suggest a structure for the fragment that accounts for this peak and offer a reason for why this fragment is so abundant.

Carbon monoxide [CO] exhibits an IR absorption at 2143cm-1, acetone [CH3C(O)CH3],exhibits an IR absorption for the CO vibration at 1715 cm-1 and ethanol [CH3CH2OH] exhibits an IR absorption for CO at ~1150 cm-1. Draw Lewis structures of these three molecules and use your structures to explain the observed differences in the CO IR absorption peak frequency (nCO).

Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the followingcompounds.(a) 2-methylpentane (b) 3-methylhex-2-ene (c) 4-methylpentan-2-ol(d) 2-methyl-1-phenylpropane (e) cyclohexyl isopropyl ether [cyclohexyl¬O¬CH(CH3)2](f) CH3CH2CH2NHC(CH3)3tert@butyl propyl amine(g) C CH3Oacetophenone(g) *(h) 3-bromo-2-methylpentane

Answer 2

Question

Chapter 12, Problem 12.18P

Interpretation Introduction

(a)

Interpretation:

The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(b)

Interpretation:

The mechanism for the fragmentation of the bond between two methylene group is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(c)

Interpretation:

The structure of the fragment ion of 2, 2, 5, 5-tetramethylhexane at m/z=71 is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

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Answer 3

Question

Chapter 12, Problem 12.18P

Interpretation Introduction

(a)

Interpretation:

The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(b)

Interpretation:

The mechanism for the fragmentation of the bond between two methylene group is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(c)

Interpretation:

The structure of the fragment ion of 2, 2, 5, 5-tetramethylhexane at m/z=71 is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

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Answer 4

Question

Chapter 12, Problem 12.18P

Interpretation Introduction

(a)

Interpretation:

The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(b)

Interpretation:

The mechanism for the fragmentation of the bond between two methylene group is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(c)

Interpretation:

The structure of the fragment ion of 2, 2, 5, 5-tetramethylhexane at m/z=71 is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

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Answer 5

Chapter 12, Problem 12.18P

Interpretation Introduction

(a)

Interpretation:

The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(b)

Interpretation:

The mechanism for the fragmentation of the bond between two methylene group is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Interpretation Introduction

(c)

Interpretation:

The structure of the fragment ion of 2, 2, 5, 5-tetramethylhexane at m/z=71 is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Answer 6

Chapter 12, Problem 12.18P

Interpretation Introduction

(a)

Interpretation:

The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Answer 7

Chapter 12, Problem 12.18P

Interpretation Introduction

(a)

Interpretation:

The bond at which fragmentation occurs in the structure of 2, 2, 5, 5-tetramethylhexane is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The mechanism for the fragmentation of the bond between two methylene group is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The mechanism for the fragmentation of the bond between two methylene group is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Answer 10

Interpretation Introduction

(c)

Interpretation:

The structure of the fragment ion of 2, 2, 5, 5-tetramethylhexane at m/z=71 is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Answer 11

Interpretation Introduction

(c)

Interpretation:

The structure of the fragment ion of 2, 2, 5, 5-tetramethylhexane at m/z=71 is to be stated.

Concept introduction:

Mass spectroscopy is used to calculate mass to charge ratio of ions. Isotopic peak is also known as (M+1) peak because it shows one unit mass more than the mass of the molecular ion. This is because the molecule consists of different isotopes of an element.

Answer 12

Expert Solution & Answer

Answer 13

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Answer 14

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Answer 15

Ch. 12 - Prob. 12.1P Ch. 12 - Prob. 12.2P Ch. 12 - Prob. 12.3P Ch. 12 - Prob. 12.4P Ch. 12 - Prob. 12.5P Ch. 12 - Prob. 12.6P Ch. 12 - Prob. 12.7P Ch. 12 - Prob. 12.8P Ch. 12 - Prob. 12.9P Ch. 12 - Prob. 12.10P

Solution Summary: The author describes the mechanism for the fragmentation of the bond between two methylene groups in 2, 2, 5, 5-tetramethylhexane.

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Chapter 12 Solutions