The tests performed on compound X and their inferences are :
`{:(" Test"," Inference"),("(a) 2, 4 - DNP test","Coloured precipitate"),("(b) Iodoform test","Yellow precipitate"),("(c) Azo-dye test","No dye formation"):}`
Compound 'X' is :

Options

A.
B.
C.
D.

Answer

To determine the identity of compound X based on the tests performed and their inferences, we will analyze each test and its corresponding inference step by step.

### Step 1: Analyze the 2,4-DNP Test
- **Test**: 2,4-DNP test (2,4-Dinitrophenylhydrazine test)
- **Inference**: Coloured precipitate formed.

**Explanation**: The formation of a colored precipitate indicates the presence of a carbonyl group (C=O), which is characteristic of either aldehydes or ketones.

### Step 2: Analyze the Iodoform Test
- **Test**: Iodoform test
- **Inference**: Yellow precipitate formed.

**Explanation**: A yellow precipitate in the Iodoform test indicates the presence of a methyl ketone (RCOCH3) or a secondary alcohol with a methyl group adjacent to the hydroxyl group. This suggests that compound X has a methyl ketone structure.

### Step 3: Analyze the Azo Dye Test
- **Test**: Azo dye test
- **Inference**: No dye formation.

**Explanation**: The absence of dye formation suggests that compound X does not contain an aromatic primary amine, which would typically react to form azo dyes. This indicates that compound X does not have a structure that includes an aromatic amine.

### Step 4: Conclusion
Based on the above analyses:
- Compound X must have a carbonyl group (from the 2,4-DNP test).
- It must be a methyl ketone or a secondary alcohol with a methyl group (from the Iodoform test).
- It cannot be an aromatic amine (from the Azo dye test).

Given these characteristics, compound X is likely to be a methyl ketone, such as acetone (propan-2-one).

### Final Answer
**Compound X is Acetone (Propan-2-one).**

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