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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

Show the structures of the fragments you would expect in the mass

spectra of the following molecules:

What functional groups might the following molecules contain?

(a) A compound with a strong absorption at 1710 cm-1

(b) A compound with a strong absorption at 1540 cm-1

(c) A compound with strong absorptions at 1720 cm-1 and 2500 to 3100cm-1

Propose structures for simple molecules that contain the following functional groups:

(a)Alcohol (b)Aromatic ring (c)Carboxylic acid (d)Amine (e)Both ketone and amine

(f) Two double bonds

Identify each pair of relationships among the groups in glucose (pink–blue, pink–dark blue, pink–black, blue–dark blue, blue-black, dark blue-black) as cis or trans.

Most stable organic species have tetravalent carbon atoms, but species with trivalent carbon atoms also exist. Carbocations are one such class of compounds.

(a) How many valence electrons does the positively charged carbon atom have?

(b) What hybridization do you expect this carbon atom to have?

(c) What geometry is the carbocation likely to have?
See all solutions

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