Topic-wise MCQs on IR spectroscopy from Instrumental Methods of Analysis for B pharmacy (Sem 7) students as per PCI Syllabus | Free MCQs for GPAT and NIPER
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1. Methanol is a good solvent for UV but not for IR spectroscopy due to
a) Methanol absorbs in UV that is above 250nm
b) Methanol absorbs weakly in the infrared region
c) Methanol absorbs strongly in the infrared region (4000-667cm-1)
d) None of the above
2. Vibrational transition exists in
(a) Infrared
(b) Microwave
(c) Radiowave
(d) X rays wave
3. Bending vibrations energy required is
a) Above 12500 cm-1
b) 4000cm-1
c) Below 1500cm-1
d) None of the above
4. Cis-1,2 dichloromethane is ir active while trans-1,2 dichloromethane is IR inactive due to
a) Symmetrical
b) Asymmetrical
c) Change in dipole moment
d) Conformational isomerism
5. Cis cinnamic acid absorbs at a higher wave number as compared to its Trans cinnamic
isomer due to
a) Hybridisation effect and attractive interactions
b) Inductive effect and repulsive interactions
c) Steric effect and repulsive interactions
d) Mesomeric effect and repulsive interactions
6. How will you show that the compound under investigation is aromatic by using
infrared technique?
a) The presence of bands due to c=c stretch at 1100cm-1,1750cm-1 and 1300cm-1
b) The presence of bands due to c=c stretch at 2720cm-1,3200cm-1 and 1000cm-1
c) The presence of bands due to c=c stretch at 1600cm-1,1500cm-1 and 1450cm-1
d) The presence of bands due to c=c stretch at 600cm-1,1200cm-1and 1850cm-1
7.In infrared spectroscopy,the pair of isomers ,which cannot be distinguished is/are
a) Cis-trans isomers
b) Functional isomers
c) Enantiomers
d) Position isomers
8. The cycloalkanones, the frequency of absorption for carbonyl group ie νc=0 increases with
a) Increases in size of the ring
b) Decreases in size of the ring
c) Decrease in bond angle
d) None of these
9. The type of hydrogen bonding in organic compounds can be distinguished by taking the
spectra after dilution with
a) Water
b) Methyl acohol
c) Carbon tetrachloride
d) Acetone
10. For a same organic compound in all the three states ,the absorption frequency has the least
value when the compound is in
a) Liquid state
b) Solid state
c) Vapour state
d) Same in all the three states
11. Infrared spectra are usually plotted as
a) Wave number vs % Absorbance
b) Concentration vs % Absorbance
c) % Transmittence vs Wave number
d) % Intensity vs Wave number
12. The IR region most widely used for qualitative analysis is
a) Near IR
b) Mid IR
c) Far IR
d) All the above
13. In FT-IR initially spectra is recorded as
a) Volts vs time
b) % Transmittance vs concentration
c) Absorbance vs Concentration
d) Absorbance vs time
14. Which of the following is a non-dispersive type of spectrophotometer?
a) Spectrofluorometer
b) Spectrophotometer
c) Flame photometer
d) FTIR
15. Which of the following bending vibration takes place in different planes.
a) Asymmetric stretching
b) Rocking
c) Scissoring
d) Twisting
16 .Non-dispersive IR spectrophotometer will not have
a) Source
b) Monochromator
c) Cell
d) Detector
17. Which of the following transitions mainly occur in IR?
a) Electronic transitions only
b) Rotational and vibrational transitions
c) Rotational transitions only
d) All the electronic, rotational, vibrational transitions
18. The Fourier transformation is a mathematical conversion of
a) Time domain to frequency domain
b) Frequency domain to time domain
c) Time domain to concentration domain
d) Concentration domain to time domain
19. The signal to noise ratio is high in
a) UV-visible spectrophotometer
b) Dispersive IR
c) FTIR
d) None of the above
20. Interferometer is present in
a) AAS
b) AES
c) FTIR
d) NMR
21. Which of the following region has more wavelengths?
a) UV
b) Far UV
c) Near IR
d) Far IR
22. Interferogram is produced as a function of
a) Change of Intensity of between two beams
b) Change of path length between two beams
c) Change of energy between two beams
d) All of the above
23. Beam splitters in IR spectroscopy are made up of
a) Cesium iodide
b) Potassium bromide
c) Cesium iodide coated germanium
d) Iron oxide coated with germanium
24. Which of the following type of samples require multiple path length for a significant
absorption in IR.
a) Solid samples
b) Liquid samples
c) Gaseous samples
d) All the above
25. Which of the following vibrational mode of CO 2 is IR active
a) Symmetric stretching
b) Asymmetric stretching
c) Both A and B
d) None
26. All of the following are the components of FTIR, except
a) Fixer mirror
b) Grating
c) Moving mirror
d) Beam splitter
27. The frequency range in C-OH group decreases along with band intensities in the order
primary>secondary>tertiary. It can be expected on the basis of
a) +I effect
b) –I effect
c) Steric effect
d) –M effect
28. In liquid samples handling technique, the plates are made up of
a) Sodium chloride
b) Dimethylformamide
c) Nujol
d) All of the above
29. In IR spectroscopy ,the gaseous samples is passed through a stopcock via a suitable gas
handling apparatus and partial pressure of ..............mm of Hg gives a reasonable levels of
absorption in most cases
a) 10 to 20 mm of Hg
b) 10 to 100mm of Hg
c) 5 to 50 mm of Hg
d ) 1to 10 mm of Hg
30. Select the correct statement about solvents used in IR spectroscopy(liquid samples)
a) Carbon tetra chloride is useful in the 4000-1350cm-1
b) Carbon disulphide is commonly used for region 1330-625cm-1
c) The concentration range employed is usually between 2-10% by weight
d) All of the above
31. Nujol (mineral oil) is using in solid samples handling, it shows two absorption bands due to
a) C-H stretching in the range of 3000-2800 cm-1 and C-H bending around 1450cm-1 and 1374cm-1
b) O-H stretching in the range of 2800 cm-1 and carboxylic acid C=O stretching vibrations occurs in 1700-1800 cm-1
c) C=O stretching vibrations occurs at 1665 cm-1 and 1680 cm-1
d ) Free N-H a narrow band appears at about 3465cm-1
32. In IR spectroscopy the strength of hydrogen bonding is also affected by
a) Ring strain
b) Molecular geometry
c) Relative acidity and basicity
d) All of the above
33. Which of the following detector depends upon the Peltier effect
a) Thermocouple
b) Thermister
c) Pyroelectric
d) Golay cell
34. Which of the following detector gives fastest response?
a) Thermocouple
b) Thermister
c) Pyroelectric
d) Golay cell
35.Which of the following detector used in FT-IR
a) Thermocouple
b) Thermister
c) Pyroelectric
d) Golay cell
36. Which of the following source is widely used in detection of organic functional groups?
a) Nernst glower
b) Globar
c) Incandescent
d) Tungsten Halogen
37. Nernst glower is composed of
a) Silicon carbide
b) Nichrome wire
c) Tunable CO2 laser
d) Rare earth oxides
38.Calculate the theoretical number of vibrational degrees of freedom in CH4 is
a) 10
b) 9
c) 4
d) 6
39. Which compound are used as diluent in IR sampling ?
a) Alkali halide
b) ketone
c) Aldehyde
d) Acetone
40. Monochromatic filter are made up of ?
a) Hydrogen peroxide
b) Silicon
c) Lithium fluoride
d) All of the above
41. On which factors the vibrational stretching frequency of diatomic molecule depend?
a) Force constant
b) Atomic population
c) Temperature
d) Magnetic field
42. In which unit Force constant is not expressed?
a) Dynes cm-1
b) dynes cm-1
c) Nm-1
d) kp
43.The vibrations, without a center of symmetry are active in which of the following
region?
a) Infrared but inactive in Raman
b) Raman but inactive in IR
c) Raman and IR
d) Inactive in both Raman and IR
44.The frequency of vibration of a bond is a function of which factor?
a) Force constant of the bond
b) Masses of the atoms involved in bonding
c) Force constant of the bond and Masses of the atoms
d) Bond order
45.What is the correct increasing order of stretching frequencies for C ≡ C, C = C and C — C?
a) C — C > C = C > C ≡ C
b) C ≡ C > C = C > C — C
c) C — C > C = C < C ≡ C
d) C ≡ C < C — C > C = C
46.Which of the following have relatively low sensitivity and slow response
a) Photon detectors
b) Thermal detectors
c) Both a and b
d) None of the above
47. Which of the following detectors are semiconductor devices
a) Photon detectors
b) Thermal detectors
c) Both a and b
d) None of the above
48. Absorption of very high energy γ photons of frequency about 1013 MHZ by nuclei these
spectra known as
a) Vibrational and rotational spectra
b) Raman spectra
c) Electronic spectra
d) Mossbaur spectra
49. Jacquinot is an advantage of
a) Dispersive IR
b) FTIR
c) Both a and b 2
d)None of the above
50. The nature of hot bands (weak absorption) may be confirmed by increasing
the..............of the sample
a) Temperature
b) Pressure
c)Temperature and pressure
d) None of the above
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