To determine which compound is achiral, we need to understand the concept of chirality. A molecule is chiral if it is not superimposable on its mirror image, and it lacks a plane of symmetry. Achiral molecules are superimposable on their mirror images and have at least one plane of symmetry.

Since the images are not visible in text, I will explain the general approach to identify achiral compounds:

Step 1: Look for a plane of symmetry. If a molecule has a plane that divides it into two mirror-image halves, it is achiral.

Step 2: Check for chiral centers. A carbon atom with four different substituents is a chiral center. Molecules with no chiral centers or with chiral centers but having a plane of symmetry (meso compounds) are achiral.

Step 3: Analyze the given structures. Without the images, I can't specify which one, but typically, compounds with internal symmetry or identical substituents on a carbon are achiral.

For example, if a compound has two identical groups on a carbon, it might have a plane of symmetry. Meso compounds, like meso-tartaric acid, have chiral centers but are achiral due to a plane of symmetry.

Based on common knowledge, the achiral compound among the options is likely the one with symmetry, such as a molecule with a plane of symmetry or no chiral centers.

Related Topics and Formulae

Chirality: A property where a molecule is not identical to its mirror image. Chiral molecules often have a chiral center (e.g., a carbon with four different groups).

Plane of Symmetry: An imaginary plane that divides the molecule into two mirror-image halves. Its presence makes the molecule achiral.

Meso Compounds: Compounds with chiral centers but overall achiral due to a plane of symmetry. They have internal compensation of optical activity.

No specific formulae, but understanding molecular symmetry is key.