The reaction between meta bromo phenyl trichloro methane and zinc with hydrochloric acid is a nucleophilic substitution reaction. Let's break down the reaction and explain it in detail:

1. Reaction Overview:
Meta bromo phenyl trichloro methane (C6H4BrCCl3) is a compound containing a bromine atom and three chlorine atoms attached to a phenyl ring. When this compound reacts with zinc (Zn) in the presence of hydrochloric acid (HCl), a substitution reaction occurs, resulting in the formation of phenyl zinc chloride (C6H5ZnCl) and the release of hydrogen gas (H2).

2. Nucleophilic Substitution:
The reaction starts with the zinc metal (Zn) acting as a reducing agent, causing the bromine atom (Br) in the meta bromo phenyl trichloro methane to be replaced by a zinc atom. This substitution occurs through a nucleophilic mechanism, where the nucleophile (Zn) attacks the electrophilic carbon atom bonded to the bromine.

3. Formation of Phenyl Zinc Chloride:
As a result of the nucleophilic substitution, the bromine atom is replaced by a zinc atom, forming phenyl zinc chloride (C6H5ZnCl). This compound is formed due to the reaction between the phenyl ring and the zinc atom.

4. Hydrogen Gas Evolution:
Simultaneously, the hydrochloric acid (HCl) present in the reaction mixture reacts with zinc (Zn) to produce hydrogen gas (H2). This reaction is a redox reaction, where zinc is oxidized to Zn2+ ions, and hydrogen ions (H+) are reduced to form hydrogen gas.

5. Overall Reaction:
The overall reaction can be summarized as follows:
Meta bromo phenyl trichloro methane + Zinc + Hydrochloric acid → Phenyl zinc chloride + Hydrogen gas

6. Significance:
The reaction between meta bromo phenyl trichloro methane and zinc with hydrochloric acid demonstrates the nucleophilic substitution reaction and the reducing property of zinc. This reaction is often used in organic synthesis to introduce a phenyl zinc chloride group into various organic compounds.

In conclusion, the reaction between meta bromo phenyl trichloro methane and zinc with hydrochloric acid involves a nucleophilic substitution reaction, resulting in the formation of phenyl zinc chloride and the liberation of hydrogen gas. This reaction is important in organic synthesis and demonstrates the reactivity of zinc as a reducing agent.