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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−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−1.

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

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Most popular questions from this chapter

Question: The mass spectrum (a) and the infrared spectrum (b) of another unknown hydrocarbon are shown. Propose as many structures as you can.

Predict the product and provide the complete electron-pushing mechanism for the following two-step synthetic processes:

Question: At what approximate positions might the following compounds showIR absorptions?

(e)

Question: Ketones undergo a reduction when treated with sodium borohydride, NaBH4.What is the structure of the compound produced by reactionof 2-butanone with NaBH4 if it has an IR absorption at 3400cm-1andM+=74in the mass spectrum?

Question: What functional groups might the following molecules contain?

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

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

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