Question

can anyone tell me why the direction of conventional current is opposite to the direction of flow of electrons​

Answer 1

Because current move from positive terminal to negative terminal but electrons have negative charge so it move from negative to positive terminals

Answer 2

The direction of an electric current is by convention the direction in which a positive charge would move. Thus, the current in the external circuit is directed away from the positive terminal and toward the negative terminal of the battery. Electrons would actually move through the wires in the opposite direction.