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Chapter 12: Q11P (page 383)

Where might the following compound have IR absorptions?

Short Answer

Expert verified

Absorption bands seen at 2210-2260 cm-1 , 1690cm-1 and 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 at1690 cm-1. This lower value is due to the presence of the ketone group nextto the double bond.
  • Alkene group - C = C -band at1640-1680 cm-1.

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Most popular questions from this chapter

Propose structures for compounds that meet the following descriptions:

  1. An optically active compound C5H10Owith an IR absorption at 1730 cm-1.
  2. A non-optically active compound C5H9N with an IR absorption at 2215cm-1.

At what approximate positions might the following compounds showIR absorptions?

(d)

The following two hydrocarbons have been isolated from various plants in the sunflower family. Name them according to IUPAC rules.

Question: 2-Methylpentane (C6H14)has the mass spectrum shown. Which peak

represents? Which is the base peak? Propose structures for fragment

ions of m/z=71, 57, 43, and 29. Why does the base peak have the mass it does?

How would you prepare the following substances, starting from any

compounds having four carbons or fewer?
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