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Test: Spectroscopy Level - 2 - Chemistry MCQ


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30 Questions MCQ Test Organic Chemistry - Test: Spectroscopy Level - 2

Test: Spectroscopy Level - 2 for Chemistry 2024 is part of Organic Chemistry preparation. The Test: Spectroscopy Level - 2 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Spectroscopy Level - 2 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Spectroscopy Level - 2 below.
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Test: Spectroscopy Level - 2 - Question 1

The correct order of IR stretching frequency of the C=C in the following olefins is:



Test: Spectroscopy Level - 2 - Question 2

Proton decoupled 13C NMR spectrum of a bicyclooctane (C8H14) exhibits only two signals. The structure of the compound is:

Detailed Solution for Test: Spectroscopy Level - 2 - Question 2

has Plane of Symmetry so, show two signals.

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Test: Spectroscopy Level - 2 - Question 3

What are the limits of detection of the following common analytical methods used with capillary separations: fluorescence, mass spectrometry, UV-Vis absorbance, and NMR, respectively, in mol:

Test: Spectroscopy Level - 2 - Question 4

Of the mo lecules CH4, CO2, benzene and H2, the ones that will absorb infrared radiation are:

Test: Spectroscopy Level - 2 - Question 5

Which one of the normal modes of ethylene is active in the infrared:

Test: Spectroscopy Level - 2 - Question 6

The vibrational stretching frequency of N2 can be determined using:

Test: Spectroscopy Level - 2 - Question 7

The number of IR active vibrational modes in ammonia is:

Test: Spectroscopy Level - 2 - Question 8

The number of vibrational degree of freedom in a gaseous mixture of 35Cl2O, 37Cl2O, and 35Cl, 37ClO is:

Test: Spectroscopy Level - 2 - Question 9

IR stretching frequencies of carbonyl groups in aldehydes and acid chlorides in cm–1 are:

Test: Spectroscopy Level - 2 - Question 10

Which among the following exhibits a carbonyl absorption band at 1770 cm–1:

Detailed Solution for Test: Spectroscopy Level - 2 - Question 10

Cyclic Esters or Lactones show absorption band at 1770 cm–1

Test: Spectroscopy Level - 2 - Question 11

Which one of the following exhibits rotational spectra:

Test: Spectroscopy Level - 2 - Question 12

The bond that gives the most intense band in the infrared spectrum for its stretching vibrations is:

Test: Spectroscopy Level - 2 - Question 13

An examinations of saturated hydrocarbons containing methyl group show asymmetrical (Vas) and symmetrical (Vs) stretching modes in the region of:

Test: Spectroscopy Level - 2 - Question 14

13C NMR spectrum of DMSO-d6 gives a signal at δ 39.7 ppm as a:

Test: Spectroscopy Level - 2 - Question 15

The molecule with the smallest rotational constant (in the microwave spectrum) among the following is:

Test: Spectroscopy Level - 2 - Question 16

Of the vibrational modes given below, the IR active mode(s) is (are):



Test: Spectroscopy Level - 2 - Question 17

Which of the fo llowing statements is/are true:

(I) HCl absorbs IR radiat ion
(II) CO2 absorbs IR radiat ion
(III) H atom absorbs IR radiation
(IV) H atom absorbs UV- vis and microwave radiation

Test: Spectroscopy Level - 2 - Question 18

N2 does not show pure vibrat ional spectral because:

Test: Spectroscopy Level - 2 - Question 19

How many normal modes does the CO2 molecule have; What if the C and the O atoms were constrained to move in one dimensional:

Test: Spectroscopy Level - 2 - Question 20

1H NMR spectrum of a mixture of benzene and acetonitrile shows two singlets of equal integration. The molar ratio of benzene: acetonitrile is:

Detailed Solution for Test: Spectroscopy Level - 2 - Question 20

The signal intensity depends on number of equivalent hydrogen and acetonitrile have 3 hydrogen and benzene have six hydrogen.

Therefore the ratio is 1 : 2

 

Test: Spectroscopy Level - 2 - Question 21

The absorption at λmax 279 nm (ε = 15) in the UV spectrum of acetone is due to:

Detailed Solution for Test: Spectroscopy Level - 2 - Question 21

The type of transition is responsible for a band at λmax = 279 nm in absorption spectrum of acetone. In case of n → π* transitions, the polar solvents form hydrogen bonds with the ground state of polar molecules more readily than with their excited states. Therefore, in polar solvents the energies of electronic transitions are increased.

Test: Spectroscopy Level - 2 - Question 22

1H NMR spectrum of an organic compound recorded on a 500 MHz spectrometer showed a quartet with line positions at 1759, 1753, 1747, 1741 Hz. Chemical shift and coupling constant (Hz) of the quartet are:

Test: Spectroscopy Level - 2 - Question 23

The correct statement in the context of NMR spectroscopy is:

Test: Spectroscopy Level - 2 - Question 24

The reaction between PI3, PSCl3 and zinc powder gives P3I5 as one of the products. The solution state 31P NMR spectrum of P3I5 shows a doublet and a triplet . The correct structure of P3I5 is:

Test: Spectroscopy Level - 2 - Question 25

The compound that exhibits following spectral data is:

1H NMR: (d, J = 12.3 Hz, 1H), 7.7 (d, J = 8.0 Hz, 2H), 6.8 (d, J = 8.0 Hz, 2H), 5.8 (d, J = 12.3 Hz, 1H), 3.8 (s, 3H), 3.0 (s, 6H) ppm

Test: Spectroscopy Level - 2 - Question 26

Number of signals present in the proton decoupled 13C NMR spectrum of the following compound is:

Detailed Solution for Test: Spectroscopy Level - 2 - Question 26

Due to Plane of Symmetry, only 4 signals are present. 

Test: Spectroscopy Level - 2 - Question 27

The structure of the compound having the following characteristics spectral data, is IR: 1690 cm–1.

1H-NMR: 1.30 (3H, t, J = 7.2 Hz); 2.41 (2H, q, J = 7.2 Hz); 2.32 (3H, s); 7.44 (1H, t, J = 7.0 Hz); 7.57 (1H, dt, J = 7.0, J = 7.0, 3.0 Hz); 7.77 (1H, t, J = 3.0 Hz); 7.90 (1H, dt, J = 7.0, 3.0 Hz); EI mass: m/z 119 (100%); 57 (80%)

Test: Spectroscopy Level - 2 - Question 28

NMR spectroscopy can be used to assay for drug binding to certain protein targets. One of the primary objective of any binding assay is the quantification of the free and the bound forms of a drug molecule at a certain concentration of the protein target. Let us assume that the fully bound drug exhibits a1H chemical shift of while that of the free from resonated at for the same proton (see figure above). If the exchange timescale (i.e. proportional to kOFF as kON is diffusion limited) between the free form of the drug and its bound form is in microseconds, which of the following statements cannot be true assuming that the drug is only 50% bound with its protein target:

Test: Spectroscopy Level - 2 - Question 29

A compound with molecule formula C5H12O2 has strong infrared absorption at 3300 to 3400 cm–1. The 1H NMR spectrum showed three singlet at and ppm; with relative 3:2:1. Addition of D2O to the sample eliminates the lower field signal. The 13C NMR spectrum shows three signals all higher than ppm. Which of the following compounds best fits this data:

Test: Spectroscopy Level - 2 - Question 30

The optimized variation wave functions gives:

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