Assertion: p-Dichlorobenzene is less soluble in organic solvents than the corresponding o-isomer
Reason o-Dichlorobenzene is polar while p-dichlorobenzene is non-polar .

Options

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

Explanation

To solve the question, we need to analyze the assertion and reason provided regarding the solubility of p-dichlorobenzene and o-dichlorobenzene.

### Step-by-Step Solution:

1. **Understanding the Assertion:**
- The assertion states that p-dichlorobenzene is less soluble in organic solvents than o-dichlorobenzene.
- To evaluate this, we need to consider the structural differences between the two isomers.

**Hint:** Recall that solubility can be influenced by molecular symmetry and how well a molecule fits into a solvent's lattice.

2. **Analyzing the Structures:**
- p-Dichlorobenzene has chlorine atoms positioned at opposite ends of the benzene ring (para position), making it more symmetrical.
- o-Dichlorobenzene has chlorine atoms adjacent to each other (ortho position), resulting in less symmetry.

**Hint:** Symmetry affects how molecules interact with each other and with solvents.

3. **Crystal Lattice Consideration:**
- The symmetrical structure of p-dichlorobenzene allows it to fit perfectly into a crystal lattice.
- This perfect fit means that more energy is required to disrupt the lattice structure for dissolution, leading to lower solubility.

**Hint:** Think about how energy is required to break intermolecular forces in solids.

4. **Polarity of the Isomers:**
- The reason states that o-dichlorobenzene is polar while p-dichlorobenzene is non-polar.
- In p-dichlorobenzene, the dipole moments of the two chlorine atoms cancel each other out, resulting in a net dipole moment of zero (non-polar).
- In o-dichlorobenzene, the dipole moments do not cancel out completely, giving it a net dipole moment (polar).

**Hint:** Remember that polarity affects solubility; polar substances tend to dissolve better in polar solvents.

5. **Conclusion:**
- Since p-dichlorobenzene is less soluble due to its ability to fit well in the lattice and being non-polar, while o-dichlorobenzene is more soluble due to its polarity and less symmetrical structure, both the assertion and reason are true.
- Additionally, the reason provided correctly explains the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.