Which one of the following objects is 'achiral'

Options

A. Letter P
B. Letter F
C. Ball
D. A pair of hand

Explanation

To determine which of the given objects is achiral, we need to understand the concept of chirality. An object is considered chiral if it cannot be superimposed on its mirror image, while an object is achiral if it can be superimposed on its mirror image.

Let's analyze the options provided:

1. **Letter P**: The letter P has a distinct asymmetry. Its mirror image cannot be superimposed onto the original letter P. Therefore, it is chiral.

2. **Letter F**: Similar to the letter P, the letter F also has an asymmetrical structure. Its mirror image cannot be superimposed on the original letter F. Thus, it is chiral as well.

3. **Ball**: A ball is a perfectly symmetrical object. Its mirror image is identical to the original ball, meaning it can be superimposed onto itself. Therefore, a ball is achiral.

4. **Pair of Hands**: A pair of human hands is inherently asymmetric. The left hand is not a mirror image of the right hand; they cannot be superimposed on each other. Hence, a pair of hands is chiral.

Based on the analysis above, the object that is achiral among the given options is the **ball**.

### Steps:
1. **Identify the objects**: Letter P, Letter F, Ball, Pair of Hands.
2. **Determine symmetry**: Analyze each object for symmetry and the ability to superimpose on its mirror image.
3. **Conclude which is achiral**: The ball is the only object that can be superimposed on its mirror image.