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Question 2 Identify the signals you would expect in the diagnostic region of the IR spectrum for...

Question:

Question 2 Identify the signals you would expect in the diagnostic region of the IR spectrum for the following compound.

a) C-H stretching signals just below 3000 cm-1, one signal around 1720 cm-1 and one broad signal from 2200 - 3600 cm-1.

b) Two signals in the 1600 - 1850 cm-1 region and C-H stretching signals just below 3000 cm-1.

c) One signal in the 1600 - 1850 cm-1 region, C-H stretching signals just below 3000 cm-1 and one signal near 3100 cm-1.

d) Two signals in the 1600 - 1850 cm-1 region, two signals around 2200 cm-1, one signal around 3300 cm-1, C-H stretching signals just below 3000 cm-1 and one signal near 3100 cm-1.

Infrared Spectroscopy

Infrared spectroscopy (IR) involves the interaction of infrared radiation with matter. Functional groups will behave (vibrate, stretch, flex, wiggle, basically move around) at different ranges on the spectra based on the type of functional group. This can be used to identify and study chemical substances.

The width and location of the peak in an IR is indicative of what functional group caused it. Alcohol and carboxylic acid peaks are very broad verses carbonyl peaks which are very narrow and sharp. Substituted benzene rings have peaks that correspond to the substitution pattern (Mono, para, meta, etc) in the fingerprint and overtone regions of the IR.

Answer and Explanation: 1

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The answer is d because

The compound has an {eq}sp {/eq} C-H which will yield a peak at 3300 {eq}cm^{-1} {/eq}.

It has a vinyl group which will...

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Infrared Spectroscopy in Forensics: Definition & Uses

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Chapter 8 / Lesson 10
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Infrared spectroscopy is an examination technique that involves the absorption of infrared light by sample materials with the goal of discovering what they are. This lesson is about infrared spectroscopy and its forensic applications.


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