$\mathrm{Zn + 2CH_3COOH \longrightarrow (CH_3COO)_2Zn + H_2}$

The above reaction is a :

In this reaction, zinc ($\text{Zn}$) is a more reactive metal that displaces hydrogen ($\text{H}$) from acetic acid ($\text{CH}_3\text{COOH}$) to form zinc acetate ($(\text{CH}_3\text{COO})_2\text{Zn}$) and hydrogen gas ($\text{H}_2$). This is a classic example of a displacement reaction where an element displaces another element from its compound.

• Option A (Decomposition reaction) is incorrect because a decomposition reaction involves a single reactant breaking down into two or more simpler products.
• Option C (Double displacement reaction) is incorrect because it involves an exchange of ions between two compounds, whereas here we have an element reacting with a compound.
• Option D (Combination reaction) is incorrect because two or more reactants combine to form a single product, whereas here we have two products formed.