Chemistry Exam  >  Chemistry Tests  >  Organic Chemistry  >  Test: NMR Spectroscopy - Chemistry MCQ

Test: NMR Spectroscopy - Chemistry MCQ


Test Description

10 Questions MCQ Test Organic Chemistry - Test: NMR Spectroscopy

Test: NMR Spectroscopy for Chemistry 2024 is part of Organic Chemistry preparation. The Test: NMR Spectroscopy questions and answers have been prepared according to the Chemistry exam syllabus.The Test: NMR Spectroscopy MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: NMR Spectroscopy below.
Solutions of Test: NMR Spectroscopy questions in English are available as part of our Organic Chemistry for Chemistry & Test: NMR Spectroscopy solutions in Hindi for Organic Chemistry course. Download more important topics, notes, lectures and mock test series for Chemistry Exam by signing up for free. Attempt Test: NMR Spectroscopy | 10 questions in 30 minutes | Mock test for Chemistry preparation | Free important questions MCQ to study Organic Chemistry for Chemistry Exam | Download free PDF with solutions
Test: NMR Spectroscopy - Question 1

An organic compound having the molecular formulae C10H14 exhibited two singlets in the 1H NMR spectrum and three signals in the 13C NMR. What is the compound?

Detailed Solution for Test: NMR Spectroscopy - Question 1

In compound a;

Here only 2 types of Hydrogen are present (two Ha & twelve Hb). So, 2 singlets only. There is no need to check 13C NMR. Still, if you check three types carbon are present (two C1, four C2 and four C2 carbon). Hence, there peak for 13C NMR.

Test: NMR Spectroscopy - Question 2

What will be the strength of coupling between geminal protons in the following molecules?

Detailed Solution for Test: NMR Spectroscopy - Question 2

Geminal proton 2J coupling i.e. coupling of H & H on same carbon.

as ring size increases, bond angle outside decreases i.e. α1 > α2 > α3 > α4 (according % s character). If B.A. decreases, 2J coupling increases.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: NMR Spectroscopy - Question 3

What are the number of signals in 1H NMR in the given molecules?

Detailed Solution for Test: NMR Spectroscopy - Question 3

Different types of proton give the different type of signals, so the different hydrogen will give different numbers of signals.
As we can see first compound has two type of hydrogen Ha and Hb. Compound second has six type of hydrogen Ha, Hb, Hc, Hd, He and H. Compound third has four type of hydrogen Ha, Hb, Hc, Hd and l forth compound has two type of hydrogen Ha and Hb.

Test: NMR Spectroscopy - Question 4

What will be the NMR frequency in MHz of bare 1H in a magnetic field of intensity 1.4092 tesla (given gN = 5.585 and μN = 5.05 x 10-27 JT-1)?

Detailed Solution for Test: NMR Spectroscopy - Question 4

By using the below formula we can calculate NMR frequency, where h is Plank’s constant.

Test: NMR Spectroscopy - Question 5

An organic compound (MF; C8H10O) exhibited the following 1H NMR special data: 62.5 (3H, s), 3.8 (314, s), 6.8 (2H, d, J 8 Hz), 7.2 (2H, d, J 8 Hz) ppm. What will be the compound among the choices?

Detailed Solution for Test: NMR Spectroscopy - Question 5

C8H10O

3Ha → 3.8, singlet (deshielded because of –I of oxygen)
3Hb → 2.5, singlet (No such –I)
2Hc → 7.2, doublet (deshielded because of anisotropy effect of benzene as well as because of –I of oxygen)
2Hd → 6.8, doublet (deshielded because of anisotropy of benzene).

Test: NMR Spectroscopy - Question 6

In NMR spectroscopy, what is the product of Nuclear ‘g’ factor (gN), the nuclear magneton and the magnetic field strength (B0)?

Detailed Solution for Test: NMR Spectroscopy - Question 6

In NMR spectroscopy. the product of Nuclear ‘g’ factor (gN), the nuclear magneton (βN) and the magnetic field strength (B0) gives the energy of transition from alpha to beta state. As shown below:

Test: NMR Spectroscopy - Question 7

The 1H NMR spectrum of a dilute solution of a mixture of acetone and dichloromethane in CDCl3 exhibits two singlets of 1:1 intensity. What will be the molar ratio of acetone to dichloromethane in the solution?

Detailed Solution for Test: NMR Spectroscopy - Question 7

If intensity is 1:1, the ratio must be 1:3

Test: NMR Spectroscopy - Question 8

What is the value of gyramagnetic ratio of proton?

Detailed Solution for Test: NMR Spectroscopy - Question 8


Where, I: nucleus spin = 1/2
μn: nuclear magneton = 5.05 × 10-27
μ: magnetic moment by protons = 2.79
h: Plank constant = 6.63 x 10-34 joule-seconds.

Test: NMR Spectroscopy - Question 9

How many peaks are expected in low-resolution NMR spectrum of vinyl chloride and ethyl cyclopropane?

Detailed Solution for Test: NMR Spectroscopy - Question 9

Vinyl chloride compound has three types of proton as shown below and ethyl cyclopropane has five types of protons so five peaks will be observed.

Test: NMR Spectroscopy - Question 10

At room temperature, what is the number of singlet resonances observed in the 1H NMR spectrum of Me3CC(O)NMe2 (N, N-Dimethylpivalamide)?

Detailed Solution for Test: NMR Spectroscopy - Question 10

As shown below; three signals are observed. 3Ha will experience shielding due to O, so They are different from 3Hb.

35 videos|92 docs|46 tests
Information about Test: NMR Spectroscopy Page
In this test you can find the Exam questions for Test: NMR Spectroscopy solved & explained in the simplest way possible. Besides giving Questions and answers for Test: NMR Spectroscopy, EduRev gives you an ample number of Online tests for practice
35 videos|92 docs|46 tests
Download as PDF