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Chapter 12: Q12-35d E (page 385)

At what approximate positions might the following compounds showIR absorptions?

(d)

Short Answer

Expert verified

(d) It shows one distinguishing absorption due to ester at 1735cm鈭�1.

Step by step solution

01

Step-by-step SolutionStep 1:IR absorption

In general, IR absorption are caused by the interaction between the IR electric field vector and molecular dipole transition related to the molecular vibrations. Absorption is at maximum when the electric field vector and dipole transition moment are parallel to each other.

02

Identify the functional group

Functional groups are groups of one or more atoms with distinctive chemical properties regardless of what is attached to them.

The atoms of functional group are bound by covalent bonds with one another and with rest of the molecule.

The functional group in compound (d) is ester only.

03

Position at which compound show IR absorptions

(d)

Given compound

(d) Absorption of ester at 1735cm鈭�1.

It shows one distinguishing absorption due to ester at 1735cm鈭�1.

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Most popular questions from this chapter

Question: At what approximate positions might the following compounds show

IR absorptions?

(b)

Question: The infrared spectrum of the compound with the mass spectrum shown below lacks any significant absorption above 3000cm-1. There is a prominent peak near 1740cm-1and another strong peak near 1200cm-1.Propose a structure consistent with the data.

Identify the functional groups in each of the following molecules:

(a) Methionine, an amino acid:

(b)Ibuprofen, a pain reliever:

(c) Capsaicin, the pungent substance in chili peppers:

Question: The nitrogen ruleof mass spectrometry says that a compound containing an odd number of nitrogen鈥檚 has an odd-numbered molecular ion.

Conversely, a compound containing an even number of nitrogen鈥檚 has

an even-numbered M+peak. Explain.

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)
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