Assertion : The lactic acid shows the geometrical isomerism.
Reason : Lactic acid has carbon-carbon double bond .

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reasonb is false
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
The assertion states that "Lactic acid shows geometrical isomerism." Geometrical isomerism typically occurs in compounds that have a carbon-carbon double bond (C=C) and different groups attached to the carbon atoms involved in the double bond.

**Hint**: Recall that geometrical isomerism is associated with the presence of a double bond and the arrangement of groups around it.

2. **Understanding the Reason**:
The reason states that "Lactic acid has a carbon-carbon double bond." To evaluate this, we need to look at the structure of lactic acid.

**Hint**: Consider the molecular structure of lactic acid to determine if it contains a C=C bond.

3. **Analyzing the Structure of Lactic Acid**:
Lactic acid (2-hydroxypropanoic acid) has the following structure:
- It contains a hydroxyl group (-OH) and a carboxylic acid group (-COOH).
- The carbon skeleton of lactic acid is CH3-CH(OH)-COOH.

**Hint**: Identify the carbon atoms in the structure and check for double bonds.

4. **Identifying the Presence of Double Bonds**:
In the structure of lactic acid, there is no carbon-carbon double bond (C=C). The functional groups present are -OH and -COOH, but there is no double bond between carbon atoms.

**Hint**: Look for any double bonds between carbon atoms in the structure.

5. **Conclusion**:
Since lactic acid does not have a carbon-carbon double bond, it cannot exhibit geometrical isomerism. Therefore, both the assertion and the reason are incorrect.

**Final Answer**: Both the assertion and reason are false.

### Summary of the Solution:
- The assertion that lactic acid shows geometrical isomerism is false.
- The reason that lactic acid has a carbon-carbon double bond is also false.
- Thus, the correct conclusion is that both statements are incorrect.