Vibrational Spectroscopy Flashcards

1
Q

Vibrational spectroscopy involves the transitions falling in the spectral range of
____________
a) 100-1000 cm-1
b) 300-3000 cm-1
c) 400-4000 cm-1
d) 500-5000 cm-1

A

c) 400-4000 cm-1

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2
Q

Which of the region of IR spectra appears between (1400-600) cm-1?
a) Functional group region
b) Fingerprint region
c) Low-frequency region
d) None of the mentioned

A

b) Fingerprint region

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3
Q

Select the correct statement from the following option.
a) Infrared spectra can identify the unknown materials
b) It can determine the amount of components in a mixture
c) It can also determine the quality of a sample
d) All of the mentioned

A

d) All of the mentioned

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4
Q

Which of the following molecule have infrared active vibrations?
a) NO
b) CH4
c) H2
d) All of the mentioned

A

a) NO

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5
Q

Which of the following cannot show a vibrational absorption spectrum?
a) OCS
b) H2O
c) CO2
d) C H2 = C H2

A

d) C H2 = C H2

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6
Q

Which of the following is not a type of bending molecular vibration?
a) Twisting
b) Stretching
c) Wagging
d) Rocking

A

b) Stretching

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7
Q

What is the absorption frequency(cm-1) of –C=N functional group?
a) 3610-3640
b) 1690-1760
c) 1180-1360
d) 2850-2960

A

c) 1180-1360

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8
Q

Presence of a functional group in a compound can be established by using
_____________
a) Chromatography
b) IR spectroscopy
c) Mass spectroscopy
d) X-ray diffraction

A

b) IR spectroscopy

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9
Q

Select the incorrect option from the following option.
a) IR spectroscopy helps in the determination of purity
b) IR spectroscopy helps in the determination of force constant from vibrational spectrum
c) IR spectroscopy helps in identifying an unknown compound
d) None of the mentioned

A

d) None of the mentioned

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10
Q

IR spectroscopy helps in detecting the presence of hydrogen bonding.
a) True
b) False

A

a) True

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