Which of the following would exhibit cis-trans isomerism?

Options

A. `CH_(3)CH_(2)CH=CH_(2)`
B. `ClCH=CHCl`
C. `ClCH=C Cl_(2)`
D. `CH_(2)=CH-COOH`

Explanation

To determine which of the given compounds exhibit cis-trans isomerism, we need to follow these steps:

### Step 1: Understand the Criteria for Cis-Trans Isomerism
Cis-trans isomerism (also known as geometric isomerism) occurs in alkenes where there is restricted rotation around a double bond. For a compound to exhibit cis-trans isomerism, it must have:
- A carbon-carbon double bond (C=C).
- Two different substituents on each carbon of the double bond.

### Step 2: Analyze Each Compound
We will analyze the given compounds one by one to check if they meet the criteria for cis-trans isomerism.

1. **Compound 1: CH3-CH=CH2**
- Structure: CH3-CH=CH2
- On the double bond (C=C), we have CH3 and H on one carbon, and H and CH2 on the other carbon.
- Since there are identical substituents (two H atoms), this compound does not exhibit cis-trans isomerism.

2. **Compound 2: Cl-CH=CH-Cl**
- Structure: Cl-CH=CH-Cl
- On the double bond, we have Cl and H on one carbon, and Cl and H on the other carbon.
- Since both carbons have identical substituents (two Cl atoms), this compound does not exhibit cis-trans isomerism.

3. **Compound 3: CH2=CH-COOH**
- Structure: CH2=CH-COOH
- On the double bond, we have H and COOH on one carbon, and H and H on the other carbon.
- Since one carbon has two identical substituents (two H atoms), this compound does not exhibit cis-trans isomerism.

### Step 3: Conclusion
After analyzing all the compounds, we find that none of the given compounds exhibit cis-trans isomerism because they either have identical substituents on one of the carbons of the double bond or do not have the required different substituents.

### Final Answer
None of the compounds listed exhibit cis-trans isomerism.

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