Domanda del libro di testo
Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the following compounds.
(b) 3-methylhex-2-ene
1467
views
Ch. 12 - Infrared Spectroscopy and Mass Spectrometry
Wade9th EditionOrganic ChemistryISBN: 9780135213728
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Tutti i libri di testo
Wade 9th EditionCh. 12 - Infrared Spectroscopy and Mass SpectrometryProblema 13a,b,c
Wade 9th EditionCh. 12 - Infrared Spectroscopy and Mass SpectrometryProblema 13a,b,cCapitolo 12, Problema 13a,b,c
Convert the following infrared wavelengths to cm-1. (a) 6.24 𝜇m, typical for an aromatic C=C (b) 3.38 𝜇m, typical for a saturated C-H bond (c) 5.85 𝜇m, typical for a ketone carbonyl
Guida verificata passo dopo passo1
Step 1: Understand the relationship between wavelength (𝜆) and wavenumber (𝜈̅). The wavenumber is the reciprocal of the wavelength and is expressed in cm⁻¹. The formula is: , where 𝜆 is the wavelength in cm.
Step 2: Convert the given wavelengths from micrometers (𝜇m) to centimeters (cm). Recall that 1 𝜇m = 10⁻⁴ cm. Multiply each wavelength by 10⁻⁴ to convert to cm.
Step 3: Apply the formula for wavenumber to each converted wavelength. For example, for part (a), substitute the converted wavelength value into the formula .
Step 4: Repeat the calculation for parts (b) and (c) using their respective converted wavelengths. Ensure that each calculation uses the correct wavelength value in cm.
Step 5: Verify the units of the final wavenumber values to ensure they are expressed in cm⁻¹, as this is the standard unit for infrared spectroscopy.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
3mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Infrared Spectroscopy
Infrared spectroscopy is a technique used to identify molecular structures by measuring the absorption of infrared light by a sample. Different functional groups absorb infrared radiation at characteristic wavelengths, allowing chemists to deduce the presence of specific bonds or groups in a molecule.
Video consigliato:
Percorso guidato
2:56
The UV-Vis Spectroscopy Concept 1
Wavelength and Wavenumber Conversion
Wavelength is the distance between successive peaks of a wave, typically measured in micrometers (𝜇m) in infrared spectroscopy. Wavenumber, expressed in cm-1, is the reciprocal of the wavelength and is commonly used in spectroscopy because it directly relates to energy levels. The conversion from 𝜇m to cm-1 involves taking the reciprocal of the wavelength in centimeters.
Video consigliato:
04:30Comparing and contrasting the Alcohol Conversions.
Functional Group Identification
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. In infrared spectroscopy, different functional groups absorb infrared light at specific wavelengths, allowing for their identification. For example, C=C bonds, C-H bonds, and carbonyl groups each have distinct absorption features that can be correlated with their respective infrared wavelengths.
Video consigliato:
02:36Identifying Functional Groups
Pratica correlata
Domanda del libro di testo
Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the following compounds. (a) 2-methylpentane
1415
views
Domanda del libro di testo
Account for the peaks at m/z 87, 111, and 126 in the mass spectrum of 2,6-dimethylheptan-4-ol.
<IMAGE>
2124
views
Domanda del libro di testo
Predict the characteristic infrared absorptions of the functional groups in the following molecules.
(a) cyclohexene
(b) pentan-2-ol
(c) pentan-2-one
1256
views
Domanda del libro di testo
Predict the characteristic infrared absorptions of the functional groups in the following molecules.
(d) pent-1-yne
(e) diethylamine
(f) pentanoic acid
1412
views
Domanda del libro di testo
Four infrared spectra are shown, corresponding to four of the following compounds. For each spectrum, determine the structure and explain how the peaks in the spectrum correspond to the structure you have chosen.
<IMAGE>
2036
views