Answer :

To understand the classification of the chemical reaction with the general formula [tex]\( nA \rightarrow (A)_n \)[/tex], we need to break down what the reaction entails.

1. Interpret the Reaction:
- The formula [tex]\( nA \rightarrow (A)_n \)[/tex] describes a process where multiple simpler molecules ([tex]\( A \)[/tex]) combine to form a more complex molecule ([tex]\( (A)_n \)[/tex]).
- In this case, 'n' represents the number of [tex]\( A \)[/tex] molecules that combine together to form a single complex molecule.

2. Classify the Reaction:
- When simpler molecules or elements combine to form a more complex molecule, it is known as a synthesis reaction.
- Synthesis reactions involve the combination of two or more substances to form a single, more complex product.

3. Verify the Definition:
- A synthesis reaction can be clearly described by the format: Reactants [tex]\( \rightarrow \)[/tex] Product where the reactants are simpler molecules or atoms (in this case, [tex]\( nA \)[/tex]) and the product is a single more complex molecule (here, [tex]\( (A)_n \)[/tex]).

Considering the above steps, the chemical reaction described by [tex]\( nA \rightarrow (A)_n \)[/tex] can be classified as a synthesis reaction.

Therefore, the chemical reaction that has the general formula [tex]\( nA \rightarrow (A)_n \)[/tex] is best classified as a synthesis reaction.