Laws of Photochemistry and Mesomeric Effect MCQs

By: Prof. Dr. Fazal Rehman | Last updated: May 22, 2025

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1. Stark-Einstein studied which aspect of photochemical reactions by applying the quantum theory of light?





2. When a beam of light passes through a transparent medium, the rate of decrease of intensity with the thickness of the medium is:





3. A resonance effect is also known as:





4. The Phenyl group shows which type of effect?





5. Greater the number of resonating structures for a given intermediate, ______ will be its stability.





6. When is the Beer-Lambert law applicable?





7. In the mesomeric effect, electrons are transferred from:





8. In photochemistry, which component of light causes a chemical reaction in a cell?





9. Which of the following is a correct statement about benzene?





10. Which of the following is also known as the Principle of Photochemical Activation?





11. The phenomenon where two or more structures with identical atom positions are possible is called:





12. Resonance energy is defined as the difference in energy between:





13. Which of the following statements is incorrect?





14. True or False: The dipole moment of CH₃–CH₂–Cl is greater than CH₂=CH–Cl.




15. The mesomeric effect influences:





16. The Grothus–Draper law is of what nature?





17. Which of the following is also called the Principle of Quantum Activation?





18. What happens to the intensity of a beam of monochromatic light as the concentration of the absorbing substance increases?





 

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