A reaction is most likely to occur when reactant particles collide with

Sufficient amount of energy and appropriate orientation.

Explanation:

A chemical reaction is most likely to occur when reactant particles collide with sufficient amount of energy needed to break bonds and

appropriate orientation .

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be

with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence