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Chapter 12: Q 11 P (page 383)

Question: Where might the following compound have IR absorptions?

Short Answer

Expert verified

Absorption bands seen at 2210-2260cm-1 , 1690 cm-1and 1640-1680cm-1 .

Step by step solution

01

Absorption spectrum

Absorption spectrum indicates dark lines presence in spectrum when radiation transmitted through a substance indicating absorption at specific wavelengths of electromagnetic radiation.

02

Chart for absorption by specific functional group

The given chart has values for absorption of particular wavelength radiation by specific functional group.

03

Functional groups present in given compound

Here three functional groups are present namely alkene, nitrile group and ketone group. Red atom indicated here is oxygen and blue atom is nitrogen according to book.

04

Absorption bands in a spectrum

Here three absorption bands will be seen:

  • Nitrile group absorption band is seen at 2210-2260 cm-1.

  • Ketone group absorption band is at 1690 cm-1. This lower value is due to the presence of the ketone group next to the double bond.

  • Alkene group -C=C- band at 1640-1680cm-1.

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Most popular questions from this chapter

Question: Two infrared spectra are shown. One is the spectrum of cyclohexane,

and the other is the spectrum of cyclohexene. Identify them, and

explain your answer.

(a)

(b)

Camphor, a saturated monoketone from the Asian camphor tree, is used among other things as a moth repellent and as a constituent of embalmingfluid. If camphor has M+=152.1201 by high-resolution mass spectrometry,what is its molecular formula? How many rings does camphor have?

From what alkyne might each of the following substances have been made? (Green = Cl.)

Amino acids can be prepared by reaction of alkyl halides with diethyl acetamidomalonate, followed by heating the initial alkylation product with aqueous HCl. Show how you would prepare alanine, CH3CH(NH2)CO2H, one of the twenty amino acids found in proteins, and propose a mechanism for acid-catalyzed conversion of the initial alkylation product to the amino acid.

The IR spectrum of phenylacetylene is shown in Figure 12-28. What absorptionbands can you identify?
See all solutions

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