Step 1: Understand the structure of perchloric acid.
Perchloric acid has the formula \( \text{HClO}_4 \). The central atom is chlorine (Cl), and it is bonded to four oxygen atoms. In this case, chlorine forms bonds with oxygen in a tetrahedral geometry.
Step 2: Analyze the bonding pattern.
The bonding between chlorine and oxygen in perchloric acid involves two single bonds and two double bonds. This structure follows the pattern \( \text{Cl} - \text{O} \) with some oxygens double-bonded to chlorine.
Step 3: Conclusion.
Thus, the correct type of bonding formed is 2-single bonds and 2-double bonds. The correct answer is:
\[
\boxed{(1)\ 2-single bonds and 2-double bonds}
\]