**Title: Interpretation of IR Spectra****Introduction:**In infrared (IR) spectroscopy, a spectrum is used to identify the chemical structures of compounds based on their interaction with IR light. The spectrum depicts the percentage transmittance (% Transmittance) on the vertical axis against the wavenumbers (cm⁻¹) on the horizontal axis.**Graph Description:**- **X-Axis (Wavenumbers):** Ranges from 4000 to 500 cm⁻¹. Wavenumbers are a measure of frequency, and different functional groups absorb IR light at characteristic frequencies.- **Y-Axis (% Transmittance):** Ranges from 0% to 100%. The higher the transmittance, the less light is absorbed at that wavelength.**Main Observations:**- **Broad peaks** around 3300 cm⁻¹, indicating N-H or O-H stretching vibrations, common in amines or alcohols.- **Sharp peaks** near 1700 cm⁻¹, typically representative of C=O stretching vibrations, indicating the presence of a carbonyl group.- **Multiple peaks** in the fingerprint region (1500-500 cm⁻¹) can correspond to complex bending and stretching modes of the molecule's structure.**Conclusion:**To identify the structure consistent with the IR spectrum, examine key absorption peaks, especially those indicating functional groups, and compare them with known reference spectra. This analysis helps in determining the molecular fingerprints of the compound being studied. Certainly! Below are transcriptions and detailed descriptions of the chemical structures depicted in the image:1. **Cyclohexanone:** - The structure shows a six-membered carbon ring (cyclohexane) with a ketone functional group (C=O) attached to it. The ketone is located at one of the corners of the carbon ring.2. **Phenol:** - This molecule consists of a six-membered aromatic benzene ring with an -OH (hydroxyl group) attached. The benzene ring is depicted with alternating double bonds, indicating aromaticity.3. **Isobutyronitrile:** - The structure illustrates a three-carbon chain with a nitrile group (C≡N) attached to the second carbon. The carbon atoms are connected in a branch-like structure, resembling an isobutyl group.4. **Acetophenone:** - This molecule has a benzene ring attached to a carbonyl group (C=O) which is further attached to a methyl group (CH₃). The carbonyl and methyl groups together form an acetyl group linked to the benzene.5. **Pentanal:** - The structure represents a straight five-carbon chain with an aldehyde group (C=O with an H atom) at the end. The aldehyde functionality is indicated by the carbonyl group connected to a terminal hydrogen atom.Each structure represents various functional groups and types of chemical bonding, serving as fundamental examples for understanding organic chemistry on an educational platform.

Infrared spectroscopy is also known as vibrational spectroscopy. IR spectra is a representation of interactions made by the matter with infrared radiation which is detected in the form of absorption, emission, or reflection. It is applied to identify the chemical structure of several organic compounds.In the given spectra, there is a strong peak for carbonyl near 1690 – 1700 .Near 600, 700, and 800 peak denotes the presence of C-H bonding for the aromatic structure of the compound.Near 1250, 1350, and 1450 peaks denote C-C stretching of the aromatic ring.The peak at 1690 matches the compound containing a conjugated carbonyl group and hence its wavenumber shifted towards a lower value. The peak at 3000-3085 match structure and shows the following structure:Hence the option ‘D" structure (Acetophenone) consists of the IR spectra shown in the question.Option -D correctAcetophenone

Answered: Which of the following structures is…

Science

Chemistry

Which of the following structures is consistent with the IR spectra shown below? % Transmittance 80 60 40 20 3500 3000 2500 2000 Wavenumbers (cm-1) 1500 1000 500

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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