IR

IR

Multiple Choice

1. In what region of an IR spectrum would you find a C–H stretch?

• 4000–3000 cm^-1.

• 3300–2700 cm^-1.

• Below 1500cm^-1

• Below 2500cm^-1

Multiple Choice

Infrared spectroscopy provides valuable information about?

• Molecular weight

• Melting point

• Conjugation

• Functional groups

Multiple Choice

Which of the following bonds would be expected to have the lowest frequency stretch?

• C–I

• C–Br

• C–Cl

• C–F

Multiple Choice

Which structure is most consistent with the following infrared spectrum?

Multiple Choice

Which is the correct order of increasing wave number of the stretching vibrations of (1) C-H (alkane), (2) O-H (alcohol), (3) C=O (ketone), and (4) C≡C (alkyne)?

• (4) < (3) < (2) < (1)

• (3) < (4) < (2) < (1)

• (3) < (4) < (1) < (2)

• (4) < (3) < (1) < (2)