The major product formed in the following reaction is

Concept:

Epoxide ring opening followed by carbocation rearrangement:

Explanation:

• In the presence of HClO₄, the compound undergoes epoxide ring opening. HClO₄ acts as an acid and protonates the O atom of the epoxide.
• In the next step, the epoxide undergoes ring opening and forms a resonance-stabilized carbocation.
• The resulting carbocation is a secondary carbocation, which undergoes a rearrangement through [1,2]H shift and finally gives the final product.

Conclusion:

Thus, the major product formed in the following reaction is
 .