There is a mixture of three solid compounds A, B and C. Out of these compounds A and Care soluble in water and compound C is sublimable also. In what sequence the following techniques can be used for their effective separation? I. Filtration II. Sublimation III. Crystallisation from water extract IV. Dissolution in water

Options

A. (II), (I), (IV), (III)
B. (IV), (I), (II), (III)
C. (I), (II), (III), (IV)
D. (II), (IV), (I), (III)

Explanation

To effectively separate the mixture of three solid compounds A, B, and C, we can follow these steps:

### Step-by-Step Solution:

1. **Sublimation**:
- Start by applying sublimation to the mixture. Since compound C is sublimable, it will transition from a solid to a gas without entering the liquid phase.
- As the gas cools, it will condense back into a solid. This process will effectively separate compound C from the mixture.

2. **Dissolution in Water**:
- Next, dissolve the remaining mixture (which now contains compounds A and B) in water.
- Since compound A is soluble in water, it will dissolve, while compound B, which is not soluble, will remain as a solid.

3. **Filtration**:
- Use filtration to separate the insoluble compound B from the soluble compound A.
- The solution containing A will pass through the filter paper, while B will be left behind on the filter paper.

4. **Crystallization from Water Extract**:
- Finally, perform crystallization on the water extract to obtain pure compound A in crystal form.
- This process allows for the separation of A from the solution, yielding pure A.

### Sequence of Techniques:
- **I. Sublimation**
- **II. Dissolution in Water**
- **III. Filtration**
- **IV. Crystallization from Water Extract**

### Final Order of Techniques:
1. **Sublimation**
2. **Dissolution in Water**
3. **Filtration**
4. **Crystallization from Water Extract**