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UV-Visible Spectroscopy Questions and Answers | UV-Visible Spectroscopy MCQs

Questions
1 What is the wavelength range for UV spectrum of light?
A 400 nm – 700 nm
B 700 nm to 1 mm
C 0.01 nm to 10 nm
D 10 nm to 400 nm

Answer:10 nm to 400 nm
2 Which of the following comparison is correct for solvent shift on the n –>π* transition of acetone?
A H20 = CH30H = C2H50H = CHC13 = C6H14
B H20 > CH30H > C2H50H > CHC13 > C6H14
C H20 < CH30H < C2H50H < CHC13 < C6H14
D H20 > CH30H < C2H50H < CHC13 < C6H14

Answer:H20 < CH30H < C2H50H < CHC13 < C6H14
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3 What is the correct order of λmax for n –> σ* transition?
A R-OH > R-NH2 > R-SH
B R-OH < R-NH2 < R-SH
C R-OH > R-SH > R-NH2
D R-OH < R-SH < R-NH2

Answer:R-OH < R-NH2 < R-SH
4 What is the correct order of λmax for n –> π* transition for the R-CN, R-NO2, and R-N=N-R?
A R-CN < R-NO2 < R-N=N-R
B R-CN = R-NO2 = R-N=N-R
C R-CN > R-NO2 > R-N=N-R
D R-CN > R-NO2 < R-N=N-R

Answer:R-CN < R-NO2 < R-N=N-R
5 What is the correct order of λmax for π –> π* transition for the following three compounds?
A R-C=C-R > R2C = CR2 > R-CHO
B R-C=C-R < R2C = CR2 < R-CHO
C R-C=C-R = R2C = CR2 = R-CHO
D R-C=C-R < R2C = CR2 >R-CHO

Answer:R-C=C-R < R2C = CR2 < R-CHO
6 What is the correct order of λmax for n–> π* transition for the following three compounds?
A RCOOH > RCOOR’ > RCONH2
B RCOOH = RCOOR’ = RCONH2
C RCOOH = RCOOR’ < RCONH2
D RCOOH = RCOOR’ > RCONH2

Answer:RCOOH = RCOOR’ = RCONH2
7 Which of the following is the correct order of λmax for n–> π* transition for the given compounds?

UV Visible Spectroscopy

A 1>2>3>4>5
B 1<2<3<4<5
C 1>2<3>4<5
D 1>2>3<4>5

Answer:1>2>3>4>5
8 The ultraviolet spectrum of benzonitrile shows a primary absorption band at 224 nm. If a solution of benzonitrile in water, with a concentration of 1x 10-4 molar, is examined at a wavelength of 224 nm, the absorbance is determined to be 1.30. The cell length is 1 cm. What is the molar absorptivity of this absorption band?
A 2.3 x 104
B 3.3 x 104
C 1.3 x 104
D 4.3 x 104

Answer:1.3 x 104
9 The ultraviolet spectrum of benzonitrile shows a secondary absorption band at 271 nm. If a solution of benzonitrile in water, with a concentration of 1×10-4 molar solution is examined at 271 nm, what will be the absorbance reading (ℇ = 1000) and what will be the intensity ratio, IO/I, respectively?
A 0.1, 1.26
B 0.2, 2.26
C 0.3, 3.26
D 0.4, 4.26

Answer:0.1, 1.26
10 Which of the following structural formula that is consistent with the following observations: An acid, C7H4O2Cl2 shows a UV maximum of 242 nm?

UV Spectroscopy

A (a)
B (b)
C (c)
D (d)

Answer:(c)

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