The given reaction  is known as

Concept:

• Glaser Reaction:

  • The Glaser reaction is a coupling reaction used to form a conjugated di-yne from two terminal alkynes, facilitated by a copper(I) catalyst:

• Schiemann Reaction:

  • The Schiemann reaction is a method to prepare aryl fluorides from aryl diazonium salts. A diazonium salt reacts with fluoroboric acid (HBF₄) and is then thermally decomposed to produce an aryl fluoride:

  • ​

• Sandmeyer Reaction:

  • The Sandmeyer reaction involves the synthesis of aryl halides from aryl diazonium salts using copper(I) chloride (Cu₂Cl₂) or copper(I) bromide (Cu₂Br₂) in the presence of hydrochloric or hydrobromic acid:

• Chlorination:

  • Chlorination is a broad term that refers to any chemical reaction involving the introduction of chlorine atoms into a molecule, either through addition, substitution, or oxidation processes.

Explanation:

This is known as the Sandmeyer reaction, a commonly used method in organic chemistry for the synthesis of aryl halides from aryl diazonium salts using copper(I) chloride or bromide catalysts in the presence of hydrochloric or hydrobromic acid.

Conclusion:

The given reaction is correctly identified as the Sandmeyer reaction.