In which of the following compound correct numbering of
parent chain is given `:-`

Options

A.
B.
C.
D.

Explanation

To solve the question regarding the correct numbering of the parent chain in the given compounds, we will analyze each compound step by step.

### Step-by-Step Solution:

1. **Identify the Compounds**:
We have four compounds to analyze. Let's denote them as Compound A, Compound B, Compound C, and Compound D.

2. **Analyze Compound A**:
- Structure: CH2=CH-CH(OH)-CH3
- Start numbering from the end closest to the functional group (OH) since it has higher priority than the double bond.
- Numbering:
- From left to right: 1 (CH2) - 2 (CH) - 3 (OH) - 4 (CH3)
- This gives the double bond the number 2, which is lower than if we started from the right.
- Conclusion: Incorrect numbering given in the question.

3. **Analyze Compound B**:
- Structure: A cyclic compound with CH2-CH3 and CH3 groups.
- Start numbering from the end closest to the double bond, which has higher priority.
- Numbering:
- If we start from the carbon with the double bond: 1 (double bond) - 2 - 3 - 4 - 5 - 6
- This gives the double bond the lowest number.
- Conclusion: Incorrect numbering given in the question.

4. **Analyze Compound C**:
- Structure: CH3-CH-CH3-CH2-CH-CH3 with a chloro substituent.
- Start numbering from the end closest to the substituent (chloro) and consider alphabetical order.
- Numbering:
- Start from the carbon with chloro: 1 (Cl) - 2 - 3 - 4 - 5
- This gives the chloro group the lowest number.
- Conclusion: Incorrect numbering given in the question.

5. **Analyze Compound D**:
- Structure: CH3-CH2-CH=CH-CH2-CH3
- Start numbering from the end closest to the double bond.
- Numbering:
- From left to right: 1 (CH3) - 2 (CH2) - 3 (double bond) - 4 - 5 - 6
- This gives the double bond the lowest number.
- Conclusion: This is the correct numbering.

### Final Answer:
The compound with the correct numbering of the parent chain is **Compound D**.