QUESTION 1 IR spectroscopy is commonly used by organic chemist to ______________

Question

QUESTION 1

IR spectroscopy is commonly used by organic chemist to ______________.

determine if a reaction is complete.

determine the carbon skeleton of the molecule

determine the presence or absence of functional groups

both a and c

1 points   

QUESTION 2

In order to see an absorbance peak in an IR spectrum, the molecule must ___________.

be symmetrical

have a change in dipole moment

only contain carbon and hydrogen

be asymmetric

1 points   

QUESTION 3

What is the degree of unsaturation for a compound with the following molecular formula, C8H8O2?

2

3

4

5

1 points   

QUESTION 4

Conjugation of the carbonyl group with a double bond will cause the peak to shift to the __________.

left

right

will not shift at all

conjugation will cause the carbonyl peak to disappear off the spectrum.

1 points   

QUESTION 5

The IR spectrum of a compound with the molecular formula C7H5N shows a weak absorption at 3100 cm-1, moderately strong absorption at 2230 cm-1, and three peaks between 1400-1500 cm-1 as the principle absorptions. The structure of this compound is ______?

acetonitrile

benzonitrile

cyclohexanecarbonitrile

4-ethynylaniline

1 points   

QUESTION 6

a

b

c

d

1 points   

QUESTION 7

The region below 1400 cm-1 on an IR spectrum is called the ____________________.

saturated region

unsaturated region

fingerprint region

trash peak region

1 points   

QUESTION 8

Peaks that are not present in an IR spectrum are just as important as the peaks that are present when determining the structure of an organic compound.

True

False

1 points   

QUESTION 9

The absorption for an internal alkyne will be more intense than the absorption for a terminal alkyne.

True

False

1 points   

QUESTION 10

a

b

c

a.

determine if a reaction is complete.

b.

determine the carbon skeleton of the molecule

c.

determine the presence or absence of functional groups

d.

both a and c

Explanation / Answer

1. D

2. B

3. D

4. B

5. B

6. A

7. C

8. True

9. False

10. A

I just had these corrected and they are all right.

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