(A) Coupling reaction of benzene diazonium chloride is an example of electrophilic substitution.
(R) : In coupling reactions benzene diazonium ion acts as electrophile.

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

Both (A) and (R) are true and (R) is the correct explanation of (A)

Assertion (A): Coupling reaction of benzene diazonium chloride is an example of electrophilic substitution.

Reason (R): In coupling reactions, benzene diazonium ion acts as electrophile.

Analysis:

The assertion is true because the coupling reaction involves the substitution of a hydrogen atom on an aromatic ring by the diazonium group, fitting the definition of electrophilic substitution.
The reason is also true as the benzene diazonium ion, being electron-deficient, serves as the electrophile in the reaction.
Furthermore, the reason correctly explains the assertion, as the electrophilic nature of the diazonium ion is the basis for the electrophilic substitution mechanism in the coupling reaction.

Both (A) and (R) are true, and (R) is the correct explanation of (A).

Understanding the Coupling Reaction of Benzene Diazonium Chloride

The coupling reaction involving benzene diazonium chloride is a fundamental concept in organic chemistry, particularly for students studying coupling reactions in class 12. This reaction exemplifies an electrophilic substitution mechanism, leading to the formation of azo compounds, which are significant in dye chemistry.

Diazonium Ion as Electrophile: In diazonium salts, the diazonium group (–N₂⁺) is electron-deficient, making it an effective electrophile in reactions with nucleophilic aromatic compounds.
Electrophilic Substitution Mechanism: The reaction proceeds through the substitution of a hydrogen atom on the aromatic ring with the diazonium group, resulting in the formation of an azo compound.

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