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WorksheetsFTIR Introduction
Total questions: 10
Worksheet time: 5mins
What is conditions of compounds to absorb IR radiation?
Molecule must be symmetrical, polar and no dipole moment
Molecule must be unsymmetrical, non-polar and no dipole moment
Molecule must be symmetrical, polar and have a dipole moment
Molecule must be unsymmetrical, polar and have dipole moment
What is the function of IR spectroscopy?
Identify the functional groups
electronic transition
nuclear spin
mass of atom
What are the units most commonly used to identify bands in FTIR spectroscopy?
Wavenumbers(cm-1)
Wavelength(m)
Frequency(Hz)
Wavelength(micrometres)
A particular bond absorbs in the IR, depends on
I- Atomic Size
II-Electronegativity
III- Bond strength
IV-Atomic mass
I and III
I and II
III and IV
II and IV
What is the predictable region for the C=C, C=O and C=N in the IR spectrum
4000-2500 cm-1
2000-1500 cm-1
2500-2000 cm-1
1500-400 cm-1
State the stretching frequencies of symmetrical and asymmetrical of C-H
1450 and 1350 cm-1
2853 and 2926 cm-1
2853 and 1450 cm-1
2926 and 2853 cm-1
For two atoms with the same weight on each end, the molecules vibrates at
lower frequency
higher frequency
strong transmittance
low transmittance
For two atoms with the same strength, the molecules with higher mass vibrates at
lower frequency
higher frequency
strong transmittance
low transmittance
What is the predictable region for the C-H, O-H and N-H in the IR spectrum
4000-2500 cm-1
2000-1500 cm-1
2500-2000 cm-1
1500-400 cm-1
What is the predictable region for the C-C, C-O, and C-N in the IR spectrum
4000-2500 cm-1
2000-1500 cm-1
2500-2000 cm-1
1500-400 cm-1
