For producing the effective collisions, the colliding molecules must posses

Options

A. a certain minimum amount of energy
B. energy equal to greater than threshold energy
C. proper geometry
D. threshold energy and proper orientation

Answer

To answer the question, "For producing the effective collisions, the colliding molecules must possess," we can break down the necessary conditions for effective collisions step by step.

### Step-by-Step Solution:

1. **Understanding Effective Collisions**:
- Effective collisions are those collisions between reactant molecules that lead to the formation of products. Not all collisions result in a reaction; only those that meet certain criteria are effective.

2. **Proper Orientation**:
- The colliding molecules must have the correct orientation. This means that the molecules need to be aligned in such a way that allows for the formation of new bonds. If the molecules collide in an incorrect orientation, they may simply bounce off each other without reacting.

3. **Sufficient Energy**:
- The colliding molecules must possess sufficient energy to overcome the energy barrier for the reaction, known as the threshold energy. This energy is necessary to break existing bonds in the reactants and form new bonds in the products.

4. **Threshold Energy**:
- Threshold energy is defined as the minimum kinetic energy that the colliding molecules must have for a reaction to occur. If the energy of the colliding molecules is below this threshold, they will not react, regardless of their orientation.

5. **Activation Energy**:
- Related to threshold energy is the concept of activation energy, which is the energy required to reach the transition state during a reaction. While threshold energy is the minimum energy needed for a reaction to occur, activation energy is the energy needed to convert reactants into products.

### Conclusion:
For producing effective collisions, the colliding molecules must possess:
- Proper orientation
- Sufficient energy (threshold energy)