The Z-isomer among the following is

Options

A.
B.
C.
D.

Explanation

To determine the Z-isomer among the given options, we need to follow these steps:

### Step 1: Identify the Groups Attached to the Double Bond
First, we need to look at the structure of the compounds provided in the question. Identify the groups attached to the carbon atoms involved in the double bond.

### Step 2: Assign Priority to the Groups
Using the Cahn-Ingold-Prelog priority rules, assign priority to the groups attached to each carbon of the double bond based on their atomic numbers. The higher the atomic number, the higher the priority.

### Step 3: Determine the Configuration
After assigning priorities, check the positions of the higher priority groups:
- If the higher priority groups are on the **same side** of the double bond, the configuration is designated as **Z** (from the German word "zusammen," meaning together).
- If the higher priority groups are on **opposite sides**, the configuration is designated as **E** (from the German word "entgegen," meaning opposite).

### Step 4: Identify the Z-Isomer
Based on the configurations determined in Step 3, identify which compound is the Z-isomer among the options provided.

### Example Application
1. **Identify the groups**: Let's say we have a compound with a double bond between two carbon atoms, each attached to different substituents.
2. **Assign priority**: For example, if one carbon is attached to Cl and CH3, and the other carbon is attached to Br and H, we assign priorities based on atomic numbers (Cl > Br > CH3 > H).
3. **Determine configuration**: If Cl (higher priority) and Br (higher priority) are on the same side of the double bond, the compound is the Z-isomer.
4. **Identify the Z-isomer**: Compare the configurations of all options and select the one where the higher priority groups are on the same side.