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UV & NMR spectroscopy

Total questions: 115

Worksheet time: 2hrs 31mins

Name
Class
Date
1.

Light of wavelength 3×10^-3 cm falls in which bonds

a)

Ultravoilet

b)

Visible

c)

Infrared

d)

Microwave

2.

A functional group that shows absorption of a charscteristic nature in the ultraviolet or visible region is called

a)

An auxochrome

b)

A bathochrome

c)

Hypsochrome

d)

A chromophore

3.

What is the wavelength range for UV spectrum of light?

a)

400 nm – 700 nm

b)

700 nm to 1 nm

c)

0.01 nm to 10 nm

d)

10 nm to 400 nm

4.

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

5.

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-Rb

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

6.

The increment for an alkyl substitution on enones is

a)

18

b)

12

c)

10

d)

5

7.

The number of double bond present in carotene is

a)

5

b)

10

c)

11

d)

18

8.

The lambda max in alpha,beta-unsaturated acids can be determined by

a)

Nielsen rules

b)

Wood ward fieser rules

c)

Fieser-kuhn rules

d)

All of above

9.

Select correct statement regarding enones.

a)

 n→π * is forbidden

b)

π →π * is forbidden

c)

Both n→π and π →π are forbidden

d)

 n→π is forbidden but π →π is allowed

10.

The compoynd used to calibrate absorbance scale of the UV- visible instruement is

a)

HCl

b)

K2Cr2O7

c)

HCl

d)

KMnO4

11.

All of the following change the absorptivity of a sample, except

a)

Concentration

b)

Molecular structure

c)

Wavelength of radiation

d)

Temperature

12.

Absoption spectra is a plot of

a)

Absorbance vs Concentration

b)

Absorvance vs wavelength

c)

% T vs wavelength

d)

% T vs concentration

13.

Positive deviation from Beer's law is due to

a)

Absorption of stray radiation

b)

Non absorption of stray radiation

c)

It does not depend on stray radiation

d)

None of above

14.

A sample containing a protilytic acid absorbs at different wavelengths. The sample can be analyzed at the wavelength of

a)

Max wavelength

b)

Max absorptivity

c)

Isosbestic point

d)

Highest pH

15.

Which one of the following shows bathochromic shift in polar solvent

a)

Water

b)

Ethanol

c)

Ethylene

d)

Chloroform

16.

The color of potassium permanganate solution is due to

a)

 n→π *

b)

π→π *

c)

 d →d*

 

d)

 n→s*

17.

Which one of the following detector has fast response time

a)

Photomultiplier tube

b)

Photo tube

c)

Barrier layer cell

d)

Photo diode array

18.

The light which reaches the detector without passing through the cellis known as

a)

Dark light

b)

Stray light

c)

Photoluminescence

d)

chemiluminescence

19.

NMR spectroscopy is used for determining structure in which one of the following materials?

a)

Radioactive materials

b)

Insoluble chemical compounds

c)

Liquids

d)

Gases

20.

NMR is the study of absorption of ...... by nuclei in a magnetic field

a)

IR radiation

b)

Radioactive radiation

c)

Microwaves

d)

Radio frequency radiations

21.

NMR spectroscopy indicates the chemical nature of the ....... and spatial positions of ......

a)

Electrons, protons

b)

Neutrons, electrons

c)

Nuclei, electrons

d)

Nuclei, neighbouring nuclei

22.

In NMR spectroscopy, the spinning nuclei in strong magnetic field must be irradiated by which one of the following?

a)

Perpendicular and stronger field

b)

Perpendicular & weaker field

c)

Parallel and stronger field

d)

Parral and stronger field

23.

NMR spectrometer provides ..... and ...... method of determining structure in soluble chemical compounds

a)

Accurate, destructive

b)

Accurate, non destructive

c)

Inaccurate, destructive

d)

Inaccurate, non destructive

24.

Nuclei having either the number of protons or neutrons as odd have ..... spin

a)

Integral spin

b)

Half integral spin

c)

Zero spin

d)

Positive spin

25.

The amount of energy available in radio frequency radiation is sufficient for which of the following

a)

Excite an atom

b)

Vibrate an atom

c)

Affect the nuclear spin of an atom

d)

Vibrate a molecule

26.

Which one of the following are considered to be the lowest form of electromagnetic radiation

a)

IR

b)

Microwaves

c)

Radiowaves

d)

UV radiation

27.

When energy is absorbed by the sample, the absorption can be observed as a change in signal developed by which of the following components

a)

Amplifier

b)

Radiofrequency detector

c)

GM counter

d)

Photodetector

28.

What is shielding in NMR?

a)

Using a curved piece of metal to block an opponent attack

b)

Putting metal around radio frequency source

c)

When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

d)

Blocking a part of a molecule from radio frequency radiation

29.

Coupling causes the peaks in 1H NMR spectra to be split into

a)

Two peaks

b)

Multiple peaks equal to the number of hydrogen on surrounding atoms

c)

Multiple peaks equal to the number of surrounding carbon atoms

d)

Multiple peaks equal to the number of hydrogen on surrounding atoms, plus one

30.

When place in a magnetic field, all the random spins of the nuclei

a)

Stop

b)

Align with the magnetcic field

c)

Rotate at 90° away from the induced field

d)

Reverse ditection

31.

Better understanding of the nuclei is possible

a)

With the help of wavelength spectrum

b)

With the help of a mathematical translator called the fourier transfer logritham

c)

With rhe help of frequency ranges

d)

None of above

32.

All hydrogen atoms

a)

Have the same resonance frequency

b)

Are attached to carbons

c)

Resonate at about same frequency as carbon

d)

Resonance at different frequencies depending on their environment

33.

Tungsten lamp filament has acquired how much temperature

a)

2000 K

b)

3000 K

c)

4000 K

d)

5000 K

34.

How much range wavelength is transmit by silicate glass

a)

100 nm to 200 nm

b)

200 nm to 300 nm

c)

300 nm to 350 nm

d)

10 nm to 40 nm

35.

Which radiation source has electrode in construction

a)

Tungsten lamp

b)

Hydrogen doscharge lamp

c)

Xenon discharge lamp

d)

Metcury lamp

36.

Diffraction grating consists of

a)

Glass

b)

Quartz

c)

Alkyl halide

d)

All of above

37.
______________ is the energy that can travel through space in the form of waves. 
a)
telescopes
b)
electromagnetic spectrum
c)
observatory
38.
Which of the following type of electromagnetic radiation has the most energy
a)
infrared
b)
ultraviolet
c)
microwaves
d)
radiowaves
39.
Which of the following type of electromagnetic  radiation has the longest wavelength
a)
infrared
b)
ultraviolet
c)
microwaves
d)
radiowaves
40.
For an electron to change from ground state to an excited stated it must...
a)
Absorb energy
b)
Release energy
41.
Which has the SHORTEST wavelength and, therefore, the highest frequency/most energy
a)
Radio waves
b)
Ultraviolet Rays
c)
Gamma Rays
d)
X-rays
42.
Emission of light from an atom occurs when an electron
a)
drops from a higher to a lower energy level.
b)
   jumps from a lower to a higher energy level.   
c)
   moves within its atomic orbital.
d)
falls into the nucleus.
43.
The ground state is the highest energy state of an atom.
a)
True
b)
False
44.
When talking about energy levels in an atom, what is an "excited state"?
a)
The highest energy state of an atom.
b)
Any level higher than the ground state.
c)
The lowest energy state of an atom.
d)
When an atom loses an electron
45.

When sunlight is split by a prism or diffraction grating it appears to emit a ___ spectra.

a)

absorption

b)

dark-line

c)

continuous

d)

bright-line

46.

Upon closer examination, sunlight (and all stars) actually emit ___ spectra.

a)

bright-line (or emission)

b)

absorption (or dark-line)

c)

continuous

d)

multiple

47.

The analysis of the way matter emits and absorbs radiation is called ___.

a)

astronomy

b)

chemistry

c)

spectroscopy

d)

atomic theory

48.

When electrons of an element reach an "excited" state, ___ lines are produced.

a)

dark

b)

emission (bright)

c)

continuous

d)

invisible

49.

A ___ is used in astronomy to break down light like a prism.

a)

telescope

b)

spectroscope

c)

stethoscope

d)

microscope

50.

Each element on the periodic table can be identified by its

a)

classification as a solid, liquid or gas.

b)

location on the table.

c)

ability to react to form compounds.

d)

unique spectral "fingerprint."

51.

The spectroscope is a powerful tool used by astronomers to infer the nature of matter.

a)

True

b)

False

52.

By passing starlight light through a ___the light is spread out into its component colors.

a)

spectrograph or spectrometer

b)

telescope

c)

prism or diffraction grating

d)

mirror

53.

A ___ can be used in place of a prism in a spectroscope & is inexpensive.

a)

plastic prism

b)

diffraction grating

c)

CCD

d)

lens

54.
NMR can only be done with 
a)
molecules
b)
1H and 13C
c)
any element with a odd number of protons
d)
any element with a odd number of nucleons
55.
The splitting pattern for the Hydrogen on the carbon at the end in high resolution 1H NMR  for CH3 CH2 CH3  
a)
a sextet
b)
a heptet
c)
a triplet
d)
isa quartet
56.
Splitting occurs only in 
a)
low resolution H NMR
b)
high resolution H NMR
c)
low resolution C NMR
d)
high resolution C NMR
57.

Which of the compound is taken as standard for recording chemical shift?

a)

Dimethylsilane

b)

Trimethylsilane

c)

Tetramethylsilane

d)

Methylsilane

58.
How many different H environment for molecule shown?
a)
4 Hydrogen environment, in (1.1.3.3) ratio
b)
4 Hydrogen environment, in (1.1.3.6) ratio
c)
3 Hydrogen environment, in (1.1.6) ratio
d)
3 Hydrogen environment, in (1.1.3) ratio
59.
How many different H enviroment for molecule shown?
a)
2 Hydrogen environment, in (9.3) ratio
b)
4 Hydrogen environment, in (3.3.3.3) ratio
c)
1 Hydrogen environment, in (12) ratio
d)
2 Hydrogen environment, in (3.3) ratio
60.

which of the following could be NOT used as a solvent for 1H NMR?

a)

CDCl3

b)

D2O

c)

CHCl3

d)

CCl4

61.

How many NMR signals in propane is

a)

4

b)

3

c)

2

d)

1

62.

Full form of NMR is

a)

Nuclear Magnetic Reaction

b)

Nuclear Magnetic Resonance

c)

Nuclear Mass Reaction

d)

Nuclear Mass Resonance

63.

How many NMR signals would be given by the compound (CH3)2CHCH2CH3

a)

1

b)

2

c)

3

d)

4

64.
NMR can only be done with 
a)
molecules
b)
1H and 13C
c)
any element with a odd number of protons
d)
any element with a odd number of nucleons
65.
The splitting pattern for the Hydrogen on the carbon at the end in high resolution 1H NMR  for CH3 CH2 CH3  
a)
a sextet
b)
a heptet
c)
a triplet
d)
isa quartet
66.
Splitting occurs only in 
a)
low resolution H NMR
b)
high resolution H NMR
c)
low resolution C NMR
d)
high resolution C NMR
67.

Which of the compound is taken as standard for recording chemical shift?

a)

Dimethylsilane

b)

Trimethylsilane

c)

Tetramethylsilane

d)

Methylsilane

68.
How many different H environment for molecule shown?
a)
4 Hydrogen environment, in (1.1.3.3) ratio
b)
4 Hydrogen environment, in (1.1.3.6) ratio
c)
3 Hydrogen environment, in (1.1.6) ratio
d)
3 Hydrogen environment, in (1.1.3) ratio
69.
How many different H enviroment for molecule shown?
a)
2 Hydrogen environment, in (9.3) ratio
b)
4 Hydrogen environment, in (3.3.3.3) ratio
c)
1 Hydrogen environment, in (12) ratio
d)
2 Hydrogen environment, in (3.3) ratio
70.

which of the following could be NOT used as a solvent for 1H NMR?

a)

CDCl3

b)

D2O

c)

CHCl3

d)

CCl4

71.

How many NMR signals in propane is

a)

4

b)

3

c)

2

d)

1

72.

Full form of NMR is

a)

Nuclear Magnetic Reaction

b)

Nuclear Magnetic Resonance

c)

Nuclear Mass Reaction

d)

Nuclear Mass Resonance

73.

How many NMR signals would be given by the compound (CH3)2CHCH2CH3

a)

1

b)

2

c)

3

d)

4

74.
Which molecule will produce the following spectra with 3 different H environment?
a)
CH3CH2OH
b)
CH3CH2COOH
c)
CH3CH2CHO
d)
CH3COOCH2OH
75.
Which molecule will produce the following spectra with 2 different H environment ?
a)
CH3CH2COCH2CH3
b)
CH3CH2COOCH2CH3
c)
CH3CH2CH2CH3
d)
CH3CH2CH2CH2CH3
76.
Which of the following type of electromagnetic radiation affects the bonds,vibrating ,stretching rocking...
a)
infrared
b)
ultraviolet
c)
microwaves
d)
radiowaves
77.
NMR can only be done with 
a)
molecules
b)
1H and 13C
c)
any element with a odd number of protons
d)
any element with a odd number of nucleons
78.
The number of peaks in 13C NMR  for CH3 CH2 CH3 is
a)
0
b)
1
c)
2
d)
3
79.
The splitting pattern for the Hydrogen on the carbon at the end in high resolution 1H NMR  for CH3 CH2 CH3  
a)
a sextet
b)
a heptet
c)
a triplet
d)
isa quartet
80.
Splitting occurs only in 
a)
low resolution H NMR
b)
high resolution H NMR
c)
low resolution C NMR
d)
high resolution C NMR
81.

A molecule absorbs IR at a wavenumber of 1720 cm-1. Which functional group could account for this absorption.

I. aldehydes

II. esters

III. alcohol

a)

I only

b)

I and II

c)

I, II and III

d)

none of the above

82.
The finger print region is 
a)
different for each organic compound
b)
 from 600 - 1400 cm-1
c)
both the above
83.
A molecule has a broadband at 3200cm-1 and sharp band at 1711cm-1. the molecule is most likely an
a)
amide
b)
ester
c)
alkanol
d)
carboxylic acid
84.

Which of the compound is taken as standard for recording chemical shift?

a)

Dimethylsilane

b)

Trimethylsilane

c)

Tetramethylsilane

d)

Methylsilane

85.
How many different H environment for molecule shown?
a)
4 Hydrogen environment, in (1.1.3.3) ratio
b)
4 Hydrogen environment, in (1.1.3.6) ratio
c)
3 Hydrogen environment, in (1.1.6) ratio
d)
3 Hydrogen environment, in (1.1.3) ratio
86.
How many different H enviroment for molecule shown?
a)
2 Hydrogen environment, in (9.3) ratio
b)
4 Hydrogen environment, in (3.3.3.3) ratio
c)
1 Hydrogen environment, in (12) ratio
d)
2 Hydrogen environment, in (3.3) ratio
87.

which of the following information is not given on an 1H NMR spectra?

a)

number of protons within that environment

b)

number of different environments a proton can be found in

c)

what might be on neighbouring atoms

d)

how much energy a bond absorbs

88.

which of the following could be NOT used as a solvent for 1H NMR?

a)

CDCl3

b)

D2O

c)

CHCl3

d)

CCl4

89.

UV radiation extends from

a)

10 nm to 400 nm

b)

100 nm to 400 nm

c)

50 nm to 400 nm

d)

150 nm to 400 nm

90.

Energy and Wavelength are ---------- to each other.

a)

Directly proportional

b)

Inversely proportional

91.

How many electronic transitions are possible in UV-Visible spectroscopy?

a)

3

b)

4

c)

5

d)

6

92.

UV spectrum is a plot of ------------ versus absorption intensity

a)

frequency

b)

wavelength

c)

wavenumber

d)

energy

93.

UV spectrum is sharp say yes or no

a)

yes

b)

no

94.

Shift of an absorption maximum to longer wavelength is called

a)

Hyperchromic shift

b)

Hypsochromic shift

c)

Bathochromic shift

d)

Hypochromic shift

95.

Which transition requires higher energy?

a)

sigma to sigma *

b)

pi to pi*

c)

n to sigma*

d)

n to pi*

96.

Which transition requires low energy?

a)

sigma to sigma *

b)

pi to pi*

c)

n to sigma*

d)

n to pi*

97.

Which one is the forbidden transition?

a)

sigma to sigma *

b)

pi to pi*

c)

n to sigma*

d)

n to pi*

98.

What is the absorption maximum value of 1,3-butadiene?

a)

215 nm

b)

216 nm

c)

217 nm

d)

219 nm

99.

Which rule is used to calculate the absorption maximum of organic compounds?

a)

Woodward-Fischer Rule

b)

Woodward Rule

c)

Woodward-Fieser Rule

d)

Fischer Rule

100.

UV-Visible region is

a)

100-900 nm

b)

200-500 nm

c)

100-800 nm

d)

200-800 nm

101.

When a molecule absorbs energy in the UV or Visible region

-------------------- transition takes place?

a)

Vibrational

b)

Rotational

c)

Electronic

d)

Vibrational-rotational

102.

Which among the following impart colour to the organic compound?

a)

Auxochrome

b)

Chromophore

c)

Chromone

d)

Auxochromone

103.

Light is an

a)

Electric radiation

b)

Magnetic radiation

c)

Electrochromic radiation

d)

Electromagnetic radiation

104.
Which of the following type of electromagnetic radiation has the most energy
a)
infrared
b)
ultraviolet
c)
microwaves
d)
radiowaves
105.
Which of the following type of electromagnetic  radiation has the longest wavelength
a)
infrared
b)
ultraviolet
c)
microwaves
d)
radiowaves
106.
For an electron to change from ground state to an excited stated it must...
a)
Absorb energy
b)
Release energy
107.
Which has the SHORTEST wavelength and, therefore, the highest frequency/most energy
a)
Radio waves
b)
Ultraviolet Rays
c)
Gamma Rays
d)
X-rays
108.
Emission of light from an atom occurs when an electron
a)
drops from a higher to a lower energy level.
b)
   jumps from a lower to a higher energy level.   
c)
   moves within its atomic orbital.
d)
falls into the nucleus.
109.
The ground state is the highest energy state of an atom.
a)
True
b)
False
110.

The analysis of the way matter emits and absorbs radiation is called ___.

a)

astronomy

b)

chemistry

c)

spectroscopy

d)

atomic theory

111.

Each element on the periodic table can be identified by its

a)

classification as a solid, liquid or gas.

b)

location on the table.

c)

ability to react to form compounds.

d)

unique spectral "fingerprint."

112.
When talking about energy levels in an atom, what is an "excited state"?
a)
The highest energy state of an atom.
b)
Any level higher than the ground state.
c)
The lowest energy state of an atom.
d)
When an atom loses an electron
113.

What is the saying that can help you remember the order of the visible spectrum?

a)

ROYGBIV

b)

RYOBIVG

c)

ROYBVIG

d)

RIBYOVG

114.

Of the visible spectrum, what color has the longest wavelength?

a)

Blue

b)

Green

c)

Yellow

d)

Red

e)

Violet

115.

___________ is a form of energy that we can see with our eyes.

a)

Radio Waves

b)

Visible Light

c)

Ultraviolet

d)

Reflection

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