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Every prominent peaks in the IR spectrum are sufficient to distinguish between which compounds? ...

Question:

Every prominent peaks in the IR spectrum are sufficient to distinguish between which compounds?

I) butane and cyclobutane

II) toluene and methylcyclohexane

III) 2-pentanone and 3-pentanone

IV) pentanal and 1-pentene

Select one:

a. I, III

b. II, III

c. II, IV

d. III, IV

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:

II and IV because IR can only separate compounds based on the presents or absence of functional groups not the location of functional groups, so you...

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Infrared Spectroscopy & Molecule Identification
Infrared Spectroscopy & Molecule Identification

from AQA A-Level Chemistry: Practice and Study Guide

Chapter 2 / Lesson 13
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