Green Synthesis MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 29, 2025

1. : Find out the percentage of atom economy for the reaction C₂H₄ + ½ O₂ → C₂H₄O (Ethylene oxide). This reaction takes place in the presence of a catalyst.
(A) 25%
(B) 100%
(C) 75%
(D) 50%

2. : ____ is also known as self thermoregulated systems.
(A) Green concepts
(B) Green synthesis
(C) Green principles
(D) Green methodologies

3. : Which of the following is the correct formula for the percentage of atom utilization?
(A) (mole weight of desired product * 100) / [mole wt of (total product + desired product)]
(B) (mole weight of desired product * 100) / mole wt of (by product + desired product)
(C) (mole weight of desired product * 100) / mole wt of (desired product + used product)
(D) (mole weight of desired product * 100) / mole wt of (desired product)

4. : Which of the following reactions involves reorganization of the atoms of the molecules?
(A) Addition reactions
(B) Elimination reactions
(C) Reorganised reactions
(D) Rearrangement reactions

5. : Which product is obtained first in the petrochemical industry, both in conventional and green synthesis methods?
(A) 2-ethyl benzene
(B) 2-methyl propyl benzene
(C) Methyl methacrylate
(D) Ethanol

6. : A fundamental advantage of sonochemistry in organic synthesis without solvents is ______.
(A) High wastes
(B) High energy requirements
(C) Use of solvents
(D) High yields

7. : ___ is the range in which the atom economy is obtained for green synthesis.
(A) 62-70%
(B) 40-50%
(C) 72-82%
(D) 90-100%

8. : _____ will be minimized by the microfluid reactor.
(A) Number of molecules
(B) Efficiency
(C) Solvent waste
(D) Number of collisions

9. : By the conventional method, the green synthesis method is _____.
(A) More costlier
(B) Less efficient
(C) Slower
(D) More efficient

10. : ___ is used in the conventional method.
(A) NaCl
(B) H₂SO₄
(C) Na₂SO₄
(D) AlCl₃

11. : As compared to the conventional methods, ____ are greener.
(A) Radio waves
(B) Electromagnetic waves
(C) Ultra violet waves
(D) Microwaves

12. : In _____, the di-basic acid is used.
(A) Impure form
(B) Liquid form
(C) Solid state
(D) Pure form

13. : _____ is known as green chemistry.
(A) Sustainable chemistry
(B) Environmental chemistry
(C) Organic chemistry
(D) Life chemistry

14. : ______ is the starting material for nylon 6-6.
(A) Acetic anhydride
(B) 2-methyl propyl benzene
(C) Nitric acid
(D) Adipic acid

15. : _____ is a catalyst used in green synthesis by avoiding harmful products.
(A) Adipic acid
(B) Benzene
(C) Cyclohexane
(D) Tungsten

16. : _____, green synthesis methods should have.
(A) Low energy requirements
(B) High harmful by-products
(C) Low efficiency
(D) Low atom efficiency

17. : _______ can be facilitated by an ideal solvent.
(A) Titration
(B) Dissolving property
(C) Combustion
(D) Mass transfer

18. : How should a desirable green solvent be?
(A) Costly
(B) Readily available
(C) Toxic
(D) Synthetic

19. : The high-quality product with no ___ is produced in green synthesis methods.
(A) Good products
(B) Contamination
(C) Reaction
(D) Catalyst

20. : ____ of an atom can be maximized by the green solvent.
(A) Efficiency
(B) Electronic configuration
(C) Velocity
(D) Molecular weight