Domanda del libro di testo
For each of the molecules shown, predict the structure of at least one major fragment in the mass spectrum.
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Ch. 14 - Structural Identification 1: Infrared Spectroscopy and Mass Spectrometry
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- 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 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: 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 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: 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: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 14 - Structural Identification 1: Infrared Spectroscopy and Mass SpectrometryProblema 68
Mullins 1st EditionCh. 14 - Structural Identification 1: Infrared Spectroscopy and Mass SpectrometryProblema 68Capitolo 13, Problema 68
What ratio of M, M + 2 , M + 4 and would you expect for 1,6-dibromohexane?
Guida verificata passo dopo passo1
Understand the concept of isotopic distribution: The problem involves calculating the isotopic distribution of a molecule, specifically 1,6-dibromohexane. Bromine has two stable isotopes, Br-79 and Br-81, which will affect the mass spectrum of the compound.
Identify the molecular formula: 1,6-dibromohexane has the molecular formula C6H12Br2. This means it contains two bromine atoms, which can be either Br-79 or Br-81.
Calculate the possible mass combinations: The molecular ion peak (M) corresponds to the mass of the molecule with both bromine atoms as Br-79. The M+2 peak corresponds to one Br-79 and one Br-81, and the M+4 peak corresponds to both bromine atoms as Br-81.
Determine the relative abundance of isotopes: The natural abundance of Br-79 is approximately 50.7% and Br-81 is approximately 49.3%. Use these percentages to calculate the expected ratio of M, M+2, and M+4 peaks.
Apply the binomial distribution: Use the binomial distribution to calculate the probability of each isotopic combination. For two bromine atoms, the probabilities are: P(M) = (0.507)^2, P(M+2) = 2 * (0.507) * (0.493), and P(M+4) = (0.493)^2. This will give you the expected ratio of the peaks.
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Isotopic Abundance
Isotopic abundance refers to the relative amount of each isotope of an element found in a natural sample. For bromine, the two main isotopes are Br-79 and Br-81, which occur in nearly equal abundance. This isotopic distribution is crucial for predicting the mass spectrum of compounds containing bromine, such as 1,6-dibromohexane.
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Mass Spectrometry
Mass spectrometry is an analytical technique used to measure the mass-to-charge ratio of ions. It helps in determining the molecular weight and structure of a compound. In the context of 1,6-dibromohexane, mass spectrometry can reveal the presence of isotopic peaks (M, M+2, M+4) due to the different combinations of bromine isotopes in the molecule.
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Molecular Ion Peak
The molecular ion peak (M) in a mass spectrum represents the ionized form of the entire molecule. For 1,6-dibromohexane, the M peak corresponds to the molecule containing two Br-79 isotopes. The M+2 and M+4 peaks arise from combinations of Br-79 and Br-81 isotopes, reflecting the isotopic pattern and helping to deduce the compound's structure.
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3:39Metal Ion Catalysis Concept 1