Two possible stereostructures of `CH_(3)CHOH.COOH`, which are optically active, are called:

Options

A. Enantiomers
B. Mesomers
C. Diasteremoers
D. Atropisomers

Answer

To solve the question about the two possible stereostructures of `CH3CHOHCOOH` that are optically active, we will follow these steps:

### Step 1: Identify the Stereocenter
The first step is to identify the stereocenter in the molecule `CH3CHOHCOOH`. A stereocenter is typically a carbon atom that is bonded to four different groups. In this case, the carbon atom in the `CHOH` group (the second carbon) is the stereocenter because it is attached to:
- A hydroxyl group (OH)
- A hydrogen atom (H)
- A methyl group (CH3)
- A carboxylic acid group (COOH)