MCQOPTIONS

Explore topic-wise MCQs in Organic Chemistry.

This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.	UV-Vis spectroscopy of organic compounds is usually concerned with which electronic transition(s)?
A.	σ → σ*
B.	n → σ*
C.	n → π* and π → π*
D.	none of these
Answer» D. none of these

2.	Beer's Law states that
A.	absorbance is proportional to both the path length and concentration of the absorbing species
B.	absorbance is proportional to the log of the concentration of the absorbing species
C.	absorbance is equal to P0 / P
D.	none of the above
Answer» B. absorbance is proportional to the log of the concentration of the absorbing species

3.	In the equation, A = ε bc, what quantity is represented by "ε"?
A.	Absorbtivity
B.	Molar absorbtivity
C.	Path length
D.	None of these
Answer» C. Path length

4.	Which of the following relationships between absorbance and %transmittance is incorrect?
A.	A = log10 100 / %T
B.	A = 2 - log10 %T
C.	A = log10 1 / T
D.	All are correct
Answer» D. All are correct

5.	Vibrational spectroscopy is
A.	a large mass on a weak spring
B.	a flashlight through a prism and shake it
C.	a class of spectroscopic techniques which analyzes molecular motions
D.	an Infrared spectroscopy
Answer» D. an Infrared spectroscopy

6.	Which type of ionic species are allowed to pass through the slit and reach the collecting plate?
A.	Negative ions of all masses
B.	positive ions of the specific mass
C.	Negative ions of the specific mass
D.	Positive ions of all masses
Answer» C. Negative ions of the specific mass

7.	Separation of ions in mass spectrometer take place on the basis of which of the following?
A.	Mass
B.	Charge
C.	Molecular weight
D.	Mass to charge ratio
Answer» E.

8.	A PMR spectrometer operates at 300 MHz. Find the value of magnetic field.Given: gN = 5.585 and BN = 5.05 x 10-27 JT-I.
A.	7.05 T
B.	6.38 T
C.	7.58 T
D.	5.93 T
Answer» B. 6.38 T

9.	Separation of ions in mass spectrometer take place on the basis of which of the following?$
A.	Mass
B.	Charge
C.	Molecular weight
D.	Mass to charge ratio
Answer» E.

10.	Which_type_of_ionic_species_are_allowed_to_pass_through_the_slit_and_reach_the_collecting_plate?
A.	Negative ions of all masses
B.	positive ions of the specific mass
C.	Negative ions of the specific mass
D.	Positive ions of all masses
Answer» C. Negative ions of the specific mass

11.	Which species of the following is used to bombard with the sample for which mass spectroscopy has been performed?
A.	Alpha particles
B.	Neutrons
C.	Electrons
D.	Protons
Answer» D. Protons

12.	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
Answer» C. Concentration of elements in the sample

13.	A PMR spectrometer operates at 300 MHz. Find the value of magnetic field.
A.
B.	7.05 T
C.	6.38 T
Answer» B. 7.05 T

14.	In which state of matter mass spectroscopy is being performed?
A.	solid
B.	liquid
C.	gaseous
D.	plasma
Answer» D. plasma

15.	Who discovered the mass spectrometer?
A.	Francis Aston
B.	J. J Thomson
C.	Ernest O. Lawrence
D.	Walter Kaufmann
Answer» C. Ernest O. Lawrence

16.	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
Answer» C. Detector System

17.	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
Answer» E.