Question

Which intermediate is formed by photochemical homolysis of a covalent bond?​

Answer 1

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The study of chemical reactions, isomerizations and physical behavior that may occur under the influence of visible and/or ultraviolet light is called Photochemistry. Two fundamental principles are the foundation for understanding photochemical transformations:

• The first law of photochemistry, the Grotthuss-Draper law, states that light must be absorbed by a compound in order for a photochemical reaction to take place.

• The second law of photochemistry, the Stark-Einstein law, states that for each photon of light absorbed by a chemical system, only one molecule is activated for subsequent reaction. This "photoequivalence law" was derived by Albert Einstein during his development of the quantum (photon) theory of light.

Answer 2

Answer:

The intermediate is formed by photochemical homolysis of a covalent bond is called Free radical.

Explanation:

Covalent bond-

CH3-CH3

      ↑

Bond present between the CH3 is Covalent bond.

In the presence of light - Uv rays bond Undergoes Photochemical Homolysis.

CH3(e-)-(e-)CH3 ⇒UV rays

2 electrons(e-) present in this bond, both electrons transfers towards the element i.e., CH3.

∴ 2 specific radicals(*) are developed along the CH3 molecule.

CH3*+CH3*⇒Free radicals are developed.

∴ The intermediate formed by photochemical homolysis of a covalent bond is = Free radical.

                                       

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