10. Explain the appearance of mle = 44 in the mass spectrum . Fig. 4.13 and Fig. 4.14 show the mass spectra of nonane and 3, 3-dimethyl heptane. Both lese compounds are isomeric compounds. Assign each given spectrum to the appropriate Compound by analysing fraginentation patterns with the aid of fragmentation ions. Scanned with Oken Scanner Orgu nd Their Bol 194 100 80 Mass Spectrosc 19. Mass spec compound 20 (M) 10 70 80 90 100 110 50 60 120 30 40 m/z 130 20 140 Fig. 4.13 100 90 20. Сompou (base pe 80 21. Compor by this 70 60 compou 22. Methyl format 50 40 30 4.20. SOLI 20 1. No par alkane 10 (no M) becaus 20 30 50 60 70 80 90 100 110 120 130 140 m/z Fig. 4.14 3/4 Relative Intensity Relative Intensity, %
Analyzing Infrared Spectra
The electromagnetic radiation or frequency is classified into radio-waves, micro-waves, infrared, visible, ultraviolet, X-rays and gamma rays. The infrared spectra emission refers to the portion between the visible and the microwave areas of electromagnetic spectrum. This spectral area is usually divided into three parts, near infrared (14,290 – 4000 cm-1), mid infrared (4000 – 400 cm-1), and far infrared (700 – 200 cm-1), respectively. The number set is the number of the wave (cm-1).
IR Spectrum Of Cyclohexanone
It is the analysis of the structure of cyclohexaone using IR data interpretation.
IR Spectrum Of Anisole
Interpretation of anisole using IR spectrum obtained from IR analysis.
IR Spectroscopy
Infrared (IR) or vibrational spectroscopy is a method used for analyzing the particle's vibratory transformations. This is one of the very popular spectroscopic approaches employed by inorganic as well as organic laboratories because it is helpful in evaluating and distinguishing the frameworks of the molecules. The infra-red spectroscopy process or procedure is carried out using a tool called an infrared spectrometer to obtain an infrared spectral (or spectrophotometer).
![Deduce the structure of the alcohol.
11. The mass spectrum of anisole exhibits prominent peaks at mle= 108 (M† base peak), 93, 78,
77 and 65. Explain the formation of ions corresponding to these peaks.
12. Rationalise the formation of peaks at mle = 122 (M), 92, 91 (100%), 65 and metastable
peaks at mle = 46.4 and 69.4 in the mass spectrum of 2-phenyl ethanol.
13. In the mass spectrum of an unknown hydrocarbon, the relative intensity of M† is 70, M† + 1
peak is 4.7 and base peak is 100. Calculate the number of carbons in the hydrocarbon.
14. Give the structure of a compound (A) C10H120 whose mass spectrum shows mle values of
15, 43, 57, 91, 105 and 148.
*0. Dxplain the appearance of mle = 44 in the mass spectrum of butanal.
*o. Fig. 4.13 and Fig. 4.14 show the mass spectra of nonane and 3, 3-dimethyl heptane. Both
iese compounds are isomeric compounds. Assign each given spectrum to the appropriate
Compound by analysing fraginentation patterns with the aid of fragmentation ions.
Scanned with Oken Scanner
Orgun-
nd Their Bol
194
100
90
Mass Spectrosc:
80
19. Mass spec
compound
70
20
(M*)
10
60
70
80
90
100
110
120
40
50
130
20
30
m/z
140
Fig. 4.13
100
20. Compou
(base pe
90
80
21. Compor
by this
70
60
compou
Methyl
22.
format
50
40
4.20. SOLI
No par
30
1.
alkane
becaus
20
10
(no M*)
20
50
60
70
80
90
100
110
120
130 140
m/z
Fig. 4.14
3/4
17. (a) Explain how to detect the presence of (i) Br (ii) Cl and (III) I in a molecule CH.
100
mass spectrometry ?
(b) Give the relative
intensities of the parent
cation for a compound
CH2B12 and CH2CI2.
18. Mass
43
| CH;CH,CH,Br
80 -
wollo
60
spectrum
of
compound (A) is given
here whose molecular
formula is C3H¬Br (Fig.
27
40
41
20
4.15).
Deduce
15
the
structure
of
compound.
the
10
20
30
40
90 100 110 1
50
60
70
80
miz
Fig. 4.15
O Scanned with Oken Scanner
Ma=
19.
Relative abundance
21. Con
by t.
com
22. Meti
form
Relative Intensity, %
Relative Intensity
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