The third possible structure that is consistent with the IR spectrum in Figure 15-25 is to be drawn. Concept introduction: IR spectroscopy enables us to identify different functional groups in the molecule. One of the greatest advantages of IR spectroscopy is that the frequency of a particular type of vibration is typically found within a characteristic range of frequencies, regardless of the functional group with which the vibration is associated. The fact that absorptions by certain vibrations appear with characteristic frequency ranges enables us to use IR spectroscopy to obtain structural information about a molecule. For identifying correct structures from the given IR spectrum, the first step is to calculate IHD from the given molecular formula of a compound. IHD accounts for the number of rings or multiple bonds the structure could possess. C=O absorption for a ketone is strong and relatively narrow that appears at ~1710 − 1730 cm -1 . The conjugated C=C or C ≡ C bonds lowers the absorption frequency of C=O by 20 − 40 cm − 1 . The terminal alkene has strong two peaks around 910 and 990 cm − 1 . The absorption stretch for alkene C − H appears at 3050 cm − 1 .

Question

Want to see the full answer?

Answer 1

Question

Chapter 15, Problem 15.28P

Interpretation Introduction

Interpretation:

The third possible structure that is consistent with the IR spectrum in Figure 15-25 is to be drawn.

Concept introduction:

IR spectroscopy enables us to identify different functional groups in the molecule.

One of the greatest advantages of IR spectroscopy is that the frequency of a particular type of vibration is typically found within a characteristic range of frequencies, regardless of the functional group with which the vibration is associated. The fact that absorptions by certain vibrations appear with characteristic frequency ranges enables us to use IR spectroscopy to obtain structural information about a molecule. For identifying correct structures from the given IR spectrum, the first step is to calculate IHD from the given molecular formula of a compound. IHD accounts for the number of rings or multiple bonds the structure could possess. C=O absorption for a ketone is strong and relatively narrow that appears at ~1710−1730 cm-1. The conjugated C=C or C≡C bonds lowers the absorption frequency of C=O by 20−40cm−1. The terminal alkene has strong two peaks around 910 and 990 cm−1. The absorption stretch for alkene C−H appears at 3050 cm−1.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

The U. S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants. The maximum level that the EPA considers safe for lead air pollution is 1.5 μg/m³ Part A If your lungs were filled with air containing this level of lead, how many lead atoms would be in your lungs? (Assume a total lung volume of 5.40 L.) ΜΕ ΑΣΦ = 2.35 1013 ? atoms ! Check your rounding. Your final answer should be rounded to 2 significant figures in the last step. No credit lost. Try again.

Y= - 0.039 (14.01) + 0.7949

Suppose 1.76 g of magnesium acetate (Mg (CH3CO2)2) are dissolved in 140. mL of water. Find the composition of the resulting electrolyte solution. In particular, list the chemical symbols (including any charge) of each dissolved ion in the table below. List only one ion per row. mEq Then, calculate the concentration of each ion in dwrite the concentration in the second column of each row. Be sure you round your answers to the L correct number of significant digits. ion Add Row mEq L x 5