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A hydrocarbon has the following mass spectrum and IR spectrum. 100 55 80 60 40 84 20 20 40 60 80 100 mlz Relative abundance

A hydrocarbon has the following mass spectrum and IR spectrum. 100 55 80 60 40 84 20 20 40 60 80 100 mlz Relative abundance

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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### Analysis of Hydrocarbon Using Mass and IR Spectra A hydrocarbon is analyzed using its mass spectrum and infrared (IR) spectrum to determine its structure. #### Mass Spectrum Analysis - **X-axis (m/z):** The mass-to-charge ratio of the ionized fragments. - **Y-axis (Relative abundance):** Shows the relative abundance of each ion detected. - Key Peaks: - **m/z = 55:** The highest peak, likely indicating the base fragment or a stable fragment. - **m/z = 84:** Another significant peak indicating a potential larger fragment of the molecule. #### IR Spectrum Analysis - **X-axis (Wavenumber in cm⁻¹):** Represents the frequency of the IR radiation absorbed. - **Y-axis (% Transmittance):** Shows how much light passes through the sample, with dips indicating absorption peaks. - Key Features: - **Broad absorption around 3000 cm⁻¹:** Typically associated with C-H stretching in alkanes or unsaturated hydrocarbons. - **Absorption around 1600 cm⁻¹:** Could indicate C=C stretching, suggesting the presence of a double bond. - **Additional peaks:** Could be linked to various bending or stretching vibrations typical of hydrocarbons. #### Possible Structures Determine which structure corresponds with the spectral data: - **A**: A straight-chain alkane. - **B**: An alkene with a double bond. - **C**: A cycloalkane (cyclic structure). - **D**: A branched alkene or alkane. #### Selection Question Which structure is consistent with the provided mass and IR spectra data? - ○ **Structure A** - ○ **Structure B** - ○ **Structure C** - ○ **Structure D** Students must analyze the provided spectra, considering key spectral features that match typical absorptions and fragmentation patterns, to choose the correct structure.
Transcribed Image Text:### Analysis of Hydrocarbon Using Mass and IR Spectra A hydrocarbon is analyzed using its mass spectrum and infrared (IR) spectrum to determine its structure. #### Mass Spectrum Analysis - **X-axis (m/z):** The mass-to-charge ratio of the ionized fragments. - **Y-axis (Relative abundance):** Shows the relative abundance of each ion detected. - Key Peaks: - **m/z = 55:** The highest peak, likely indicating the base fragment or a stable fragment. - **m/z = 84:** Another significant peak indicating a potential larger fragment of the molecule. #### IR Spectrum Analysis - **X-axis (Wavenumber in cm⁻¹):** Represents the frequency of the IR radiation absorbed. - **Y-axis (% Transmittance):** Shows how much light passes through the sample, with dips indicating absorption peaks. - Key Features: - **Broad absorption around 3000 cm⁻¹:** Typically associated with C-H stretching in alkanes or unsaturated hydrocarbons. - **Absorption around 1600 cm⁻¹:** Could indicate C=C stretching, suggesting the presence of a double bond. - **Additional peaks:** Could be linked to various bending or stretching vibrations typical of hydrocarbons. #### Possible Structures Determine which structure corresponds with the spectral data: - **A**: A straight-chain alkane. - **B**: An alkene with a double bond. - **C**: A cycloalkane (cyclic structure). - **D**: A branched alkene or alkane. #### Selection Question Which structure is consistent with the provided mass and IR spectra data? - ○ **Structure A** - ○ **Structure B** - ○ **Structure C** - ○ **Structure D** Students must analyze the provided spectra, considering key spectral features that match typical absorptions and fragmentation patterns, to choose the correct structure.
Expert Solution
Step 1

structure B is the correct 

Chemistry homework question answer, step 1, image 1

IR DATA SHOW PEAK at 3000 it is peak of C-H bond

at 1600 show C=C bond( streching)

at 900 show C=C  (bending)

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