1. Identify the region with the longest wavelength. a) Xrays b) Ultraviolet c) V

Question

1. Identify the region with the longest wavelength. a) Xrays b) Ultraviolet c) Visible d) Infrared e) Microwave 2. Identify the region with the highest energy. a) X rays b) Ultraviolet c) Visible d) Infrared e) Microwave 3. Which of the following is not one of the infrared vibrations? a) Bouncing b) Wagging c) Scissoring d) Rocking e) Twisting 4. Identify the frequency that indicates an alkene. a) 1660 cm- b) 1700 cm 1 c) 2200 cm1 d) 3300 cm-1 5. Identify the frequency that indicates a C-H bond stretching frequency for an alkane a) 1660 cm1 b) 2900 cm 1 c) 3050 cm1 d) 3300 cm-1

Explanation / Answer

1) e) Microwave (longest wave length among the options given)

2) a) X-rays (highest energy among the options given)

3) a) bouncing ( It is not cosidered as vibration mode)

4) a) 1660 cm-1 ( It is characteristic frequency of C=C stretching)

5) b) 2900 cm-1 ( alkane C-H stretching frequency)

6) a) sp ( C-H of alkyne has highest frequency 3300 cm-1)

7) d) terminal alkyne ( C-H, has frequency at 3300 cm-1)

8) b) alcohol ( O-H, has frequency at 3300 cm-1)

9) d) primary amine ( -NH2, has two peaks at frequency 3300 cm-1)

10) b) aldehyde ( 1710 for C=O, 2700 for O=C-H )

11) c) Carboxylic acid (1715 for C=O, 3000 for O-H )

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