Organic Chemistry Multiple Choice Questions and Answers

1 Which of the following statement is false for mass spectroscopy?

A Mass spectroscopy is used to identify unknown compounds within a sample, and to elucidate the structure and chemical properties of different molecules

B Particle are characterized by their mass to charge ratios (m/z) and relative abundances

C This technique basically studies the effect of ionizing energy on molecules

D This technique can be used on all state of matter

View Answer

Answer: This technique can be used on all state of matter

2 Which of the following main component of mass spectroscopy deal with resolving the ions into their characteristics mass components according to their mass-to-charge ratio?

A Ion Source

B Analyzer

C Detector System

D Analyzer tube

View Answer

Answer: Analyzer

3 Who discovered the mass spectrometer?

A Francis Aston

B J. J Thomson

C Ernest O. Lawrence

D Walter Kaufmann

View Answer

Answer: J. J Thomson

4 In which state of matter mass spectroscopy is being performed?

A solid

B liquid

C gaseous

D plasma

View Answer

Answer: gaseous

5 A PMR spectrometer operates at 300 MHz. Find the value of magnetic field. Given: g_N = 5.585 and B_N = 5.05 x 10^-27 JT^-I.

A 7.05 T

B 6.38 T

C 7.58 T

D 5.93 T

View Answer

Answer: 7.05 T

6 What are the main criteria on which mass spectrometer used for?

A Composition in sample

B Relative mass of atoms

C Concentration of elements in the sample

D Properties of sample

View Answer

Answer: Relative mass of atoms

7 A compound of molecular formula C₈H_{7ClO shows a prominent band in its IR spectrum at 1690 cm^-1. ¹H NMR spectrum revealed only two major types of protons in the ratio of 5: 2. Which one of the following structures best fits the above data?}