Textbook Question
Besides the molecular mass, how do you know that the fragment that gives rise to the peak at m/z 111 in the mass spectrum for 1-bromo-4-chlorobenzene contains only chlorine?
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Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 14 - Structural Identification I: Infrared Spectroscopy and Mass SpectrometryProblem 31
Mullins 1st EditionCh. 14 - Structural Identification I: Infrared Spectroscopy and Mass SpectrometryProblem 31Chapter 13, Problem 31
The presence of what atom is indicated by the following mass spectrum?
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Examine the mass spectrum for the presence of a molecular ion peak, which is the peak with the highest m/z value. This peak represents the molecular weight of the compound.
Look for any characteristic isotope patterns. For example, chlorine and bromine have distinct isotope patterns due to their natural isotopic abundances (Cl: 35 and 37, Br: 79 and 81).
Identify any significant peaks that are 1 or 2 m/z units apart, which could indicate the presence of isotopes such as carbon (C-12 and C-13) or nitrogen (N-14 and N-15).
Check for the presence of a peak at m/z = 18, which could indicate the presence of water (H2O) or a hydroxyl group (OH).
Consider the presence of a peak at m/z = 15, which is often indicative of a methyl group (CH3).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Mass Spectrometry
Mass spectrometry is an analytical technique used to measure the mass-to-charge ratio of ions. It helps identify the composition of a sample by analyzing the mass spectrum, which displays the masses of detected ions and their relative abundances. Understanding how to interpret these spectra is crucial for identifying specific atoms or molecules present in a sample.
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01:25
How to Read a Mass Spectrum
Isotopic Patterns
Isotopic patterns refer to the distinct mass spectral peaks that arise due to the presence of isotopes of an element. Different isotopes have different masses, and their relative abundance can create characteristic patterns in a mass spectrum. Recognizing these patterns is essential for identifying elements, as certain isotopes are unique to specific atoms.
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08:06Common Splitting Patterns
Fragmentation
Fragmentation in mass spectrometry involves the breaking of molecular bonds, resulting in smaller ion fragments. These fragments can provide information about the structure of the original molecule. Understanding fragmentation patterns helps in deducing the presence of specific atoms or functional groups within a compound, as certain atoms may lead to characteristic fragmentation behaviors.
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Related Practice
Textbook Question
The molecule that gave the mass spectrum shown here contains a halogen. Which halogen is present?
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Textbook Question
Match each of the four IR spectra to one of the given compounds. [One of the compounds does not match a spectrum.]
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Textbook Question
In the mass spectrum of hexan-3-ol, identify the fragments arising from two α-cleavage fragmentations and one dehydration fragmentation.
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Textbook Question
Match each of the four IR spectra to one of the given compounds. [One of the compounds does not match a spectrum.]
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Textbook Question
The molecular ion (M) is significant in the mass spectrum of benzyl fluoride, but it is barely present in the mass spectrum of benzyl iodide. Why might this be the case?
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