IR spectroscopy can be used to differentiate between the reactant and the produc

Question

IR spectroscopy can be used to differentiate between the reactant and the product in the reaction based on functional group changes. Give the identity of one type of absorption and how it could be used to determine whether or not the conversion took place. Include the typical frequency and the actual frequency for this type of bond in your statement.  Be sure to include correct units. USE ONLY TYPICAL FREQUENCY RANGES FROM THE SPECTRAL CORRELATION TABLE PROVIDED IN APPENDIX I.

2-methyl-2 2-methyl-1 pentanol Actual Frequency Frequency Frequency pentene Actual Typical Functional Group OH stretch C-O stretch 3000-3700 900-1300 sp CH stretch 2800-3000 sp CH stretch 3000-3300 1600-1700 3616 1162 2964 2962 3076 1661 C-C stretch

Explanation / Answer

There is already an example given in the problem itself.

Here, I'm presenting another example: The conversion of 2-methyl-2-butanol to 2-methyl-2-butene

The IR table is according to the data shown below.

Functional Group

Typical Frequency

            (cm-1)

2-methyl-2-butanol

2-methyl-2-butene

Actual frequency (cm-1)

Actual frequency       (cm-1)

OH stretch

3000-3700

3371

x

C-O stretch

900-1300

1167

X

Sp3 CH stretch

2800-3000

2971

2969

Sp2 CH stretch

3000-3300

x

3076

C=C stretch

1600-1700

x

1650

Functional Group

Typical Frequency

            (cm-1)

2-methyl-2-butanol

2-methyl-2-butene

Actual frequency (cm-1)

Actual frequency       (cm-1)

OH stretch

3000-3700

3371

x

C-O stretch

900-1300

1167

X

Sp3 CH stretch

2800-3000

2971

2969

Sp2 CH stretch

3000-3300

x

3076

C=C stretch

1600-1700

x

1650

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