The incorrect statement for rhombic sulphur is

Options

A. It is insoluble in water
B. It exist as `S_8` molecules, which is puckered crown ring structure
C. It is white in colour
D. Its melting point is lower than monoclinic sulphur

Answer

To determine the incorrect statement about rhombic sulfur, let's analyze the properties and characteristics of rhombic sulfur step by step.

### Step 1: Identify the Molecular Structure
- Rhombic sulfur is composed of cyclic molecules, specifically S8. This means that each molecule consists of eight sulfur atoms arranged in a crown-like structure.

**Hint:** Remember that the molecular formula for sulfur in its most stable form is S8.

### Step 2: Solubility in Water
- Rhombic sulfur is known to be insoluble in water. This is because sulfur does not react with water and remains unaltered in its solid form.

**Hint:** Consider the nature of sulfur and its interaction with polar solvents like water.

### Step 3: Crown Ring Structure
- When discussing the structure of rhombic sulfur, it is important to note that it exists in a crown ring structure, which is characteristic of its molecular form.

**Hint:** Visualize the arrangement of sulfur atoms in the S8 molecule to understand the crown ring structure.

### Step 4: Melting Point Comparison
- The melting point of rhombic sulfur is 96 degrees Celsius, while monoclinic sulfur has a melting point of 118 degrees Celsius. Therefore, it is incorrect to say that rhombic sulfur has a lower melting point than monoclinic sulfur; in fact, it has a higher melting point.

**Hint:** Compare the melting points of both forms of sulfur to identify which one is higher.

### Conclusion
- The incorrect statement regarding rhombic sulfur is that its melting point is lower than that of monoclinic sulfur. The correct information is that rhombic sulfur has a lower melting point than monoclinic sulfur.

### Final Answer
The incorrect statement for rhombic sulfur is: "Its melting point is lower than monoclinic sulfur."