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Test: Spectroscopy Level - 3 - Chemistry MCQ


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30 Questions MCQ Test Organic Chemistry - Test: Spectroscopy Level - 3

Test: Spectroscopy Level - 3 for Chemistry 2024 is part of Organic Chemistry preparation. The Test: Spectroscopy Level - 3 questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Spectroscopy Level - 3 MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Spectroscopy Level - 3 below.
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Test: Spectroscopy Level - 3 - Question 1

The spectroscopic data for an organic compound with molecular formula C10H12O2 are given below. IR band around 1750 cm–1. 1H NMR (m, 5H), 5.85 (q, 1H, J = 7.2 Hz), 2.05 (s, 3H), 1.5 (d, 3H, J = 7.2 Hz) ppm. The compound is:

Test: Spectroscopy Level - 3 - Question 2

The correct order of the 1H NMR chemical shift values for the indicated hydrogens (in bold) in the following compounds is:




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Test: Spectroscopy Level - 3 - Question 3

Which of the following compound show only two signals in 1H NMR and a strong IR bond at ~ 1690 cm-1:

Test: Spectroscopy Level - 3 - Question 4

The correct order of 1H NMR chemical shift values for the labeled methyl groups in the following compound is:

Test: Spectroscopy Level - 3 - Question 5

The 1H NMR spectrum of a compound with molecular formula C3H7NO shows the following features:

Which of the following is in agreement with this information:

Test: Spectroscopy Level - 3 - Question 6

The two fine–structure components of a nuclear magnet ic resonance transit ion are observed at chemical shifts of 2.142 and 2.208 ppm in a 300 MHz NMR spectrometer. Calculate the coupling constant:

Test: Spectroscopy Level - 3 - Question 7

 A C5H12O2 compound has strong infrared absorption at 3300 to 3400 cm-1 The 1H NMR spectrum has three singlets at δ 0.9 , δ 3.45 and δ3.2 ppm; relative areas 3:2:1. The 13C NMR spectrum shows three signals all at higher field than δ100 ppm. Suggest a structure for this compound.

Test: Spectroscopy Level - 3 - Question 8

The 1H NMR spectrum of a compound A shows a doublet and a septet. Which one of the following statements is true:

Test: Spectroscopy Level - 3 - Question 9

A compound of formula C5H12 gives one signal in the 1H NMR and two signals in the 13C NMR spectra. The compound is:

Detailed Solution for Test: Spectroscopy Level - 3 - Question 9

Test: Spectroscopy Level - 3 - Question 10

The most appropriate spectroscopy for the identification of a nitrile group is:

Test: Spectroscopy Level - 3 - Question 11

Compound I gives a strong infrared absorption at 1730 cm-1. 1H NMR spectrum indicates that it has two types of hydrogen atoms; one H atom appearing as signlet at = 9.7 ppm and 9H atoms appearing as a singlet at = 1.2 ppm. The structure of I is:

Test: Spectroscopy Level - 3 - Question 12

The functionality that shows a typical characteristic peak at 2250 cm-1 in IR is:

Test: Spectroscopy Level - 3 - Question 13

Consider a 1H NMR spectrum in which a quartet and a doublet appeared at 9.72 and 2.40 ppm, respectively. Which of the following compounds is the most probable one:

Test: Spectroscopy Level - 3 - Question 14

The order of decreasing chemicals shift in 1H NMR for the underlined hydrogens is:

(I) H3C – CH2 – CH3
(II) H3C – O – CH2 – CH3
(III) Cl2 – CH – O – CH2 – CH3
(IV) Cl – CH2 – O – CH2 – CH3

Test: Spectroscopy Level - 3 - Question 15

The number of normal modes of vibration in the benzene molecule is:

Test: Spectroscopy Level - 3 - Question 16

An organic compound (MF: C8H10O) exhibited the following 1H NMR spectral data: 2.5 (3 H,s), 3.8 (3H, s), 6.8 (2 H, d, J 8 Hz), 7.2 (2 H, d, J 8 Hz) ppm. The compound among the choices is:

Test: Spectroscopy Level - 3 - Question 17

The 1H NMR spectrum of 1, 4-dimethoxybenzene will have:

Test: Spectroscopy Level - 3 - Question 18

Appropriate 1H NMR chemical shifts  for the protons A-D for the following compound are:

Test: Spectroscopy Level - 3 - Question 19

Compound A and B exhibit two singlets, each in their 1H NMR spectra. The expected chemical shifts are at :

Test: Spectroscopy Level - 3 - Question 20

In the 1H NMR spectrum recorded at 293 K, an organic compound (C3H7NO), exhibited signals at δ 7.8 (1H, s), 2.8 (3H, s) and 2.6 (3H, s). The compound is:

Test: Spectroscopy Level - 3 - Question 21

An organic compound exhibited the following 1H NMR spectra data:

7.80 (2 H, d, J = 8 Hz), 6.80 (2 H, d, J = 8 Hz), 4.10 (2 H, q, J = 7.2 Hz), 2.4 (3H, s), 1.25 (3 H, t, J = 7.2 Hz)

The compound, among the choices given below is,

Test: Spectroscopy Level - 3 - Question 22

In NMR spectroscopy the product the nuclear ‘g’ factor (gN), the nuclear magneton (βN) and the magnetic field strength (B0) gives the: 

Test: Spectroscopy Level - 3 - Question 23

Among the isomers of C4H6 given below, the compound which exhibits an absorption band at 3300 cm-1 in the IR spectrum, is:

Test: Spectroscopy Level - 3 - Question 24

Which of the following absorptions is shown by 1, 3-butadiene in its UV absorption spectrum recorded in n-hexane (εmax is the molar absorptivity):

Test: Spectroscopy Level - 3 - Question 25

Match the observed principal absorptions in the visible spectrum shown in List-I wit h the bond shows this absorption in List–II:

Test: Spectroscopy Level - 3 - Question 26

The correct structure of the compound based on the following characteristic spectral data is IR: 1736 cm–1

1H NMR: 3.59 (s, 3H), 3.32 (t, 2H), 2.25 (t, 2H), 1.85-1.75 (m, 2H), 1.73-1.62 (m, 2H)
13C NMR: 174.0, 51.0M 32.9, 32.8, 31.0, 23.0

Test: Spectroscopy Level - 3 - Question 27

In atomic absorption spectroscopy, the atomization process utilizes:

Test: Spectroscopy Level - 3 - Question 28

The absorption at λmax 279 nm in the UV spectrum of acetone is due to:

Test: Spectroscopy Level - 3 - Question 29

An organic compound having the molecular formula C10H14 exhibited two singlets in the 1H NMR spectrum and three signals in the 13C NMR spectrum. The compound is:

Test: Spectroscopy Level - 3 - Question 30

A compound with molecular formula C5H10O, exhibit following 1H NMR spectral data - 0.95 (6H, d), 2.10 (3H, S), 2.43 (1H, m). The structure is:

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