When is a molecule said to be chiral?

Explanation

To determine when a molecule is said to be chiral, we can follow these steps:

### Step-by-Step Solution:

1. **Definition of Chirality**: A molecule is said to be chiral if it cannot be superimposed on its mirror image. This means that the molecule and its mirror image are distinct from one another.

2. **Understanding Superimposition**: To check for chirality, one can create a mirror image of the molecule. If you can place the original molecule over its mirror image and they do not match perfectly, then the molecule is chiral.

...