A copound which can give iodoform test , bromine water test ,`FeCl_(3)`test but not Tollen's test

Options

A.
B.
C.
D.

Answer

To solve the question regarding a compound that gives the iodoform test, bromine water test, and FeCl3 test but does not give Tollen's test, we can follow these steps:

### Step 1: Understand the Tests
1. **Iodoform Test**: This test is positive for compounds containing the structure R-CO-CH3 (methyl ketones) or can be oxidized to form such a structure. A yellow precipitate (CHI3) indicates a positive result.

2. **Bromine Water Test**: This test detects unsaturation (double or triple bonds) in compounds. Compounds with alkenes or alkynes will decolorize bromine water, indicating a positive result. Aromatic compounds like benzene do not give this test.

3. **FeCl3 Test**: This test is used for phenolic compounds. A positive result is indicated by the formation of a colored complex (usually purple).

4. **Tollen's Test**: This test is specific for aldehydes. A positive result is indicated by the formation of a silver mirror when Tollen's reagent (AgNO3 in NH4OH) is added.

### Step 2: Identify the Compound
- We need a compound that gives positive results for the iodoform test, bromine water test, and FeCl3 test but does not give a positive Tollen's test.

### Step 3: Analyze Each Test
1. **Iodoform Test**: The compound must have a CO-CH3 group or be oxidizable to this structure.
2. **Bromine Water Test**: The compound must have a double or triple bond (alkene or alkyne).
3. **FeCl3 Test**: The compound must contain a phenolic group.
4. **Tollen's Test**: The compound must not have an aldehyde group or terminal alkyne.

### Step 4: Evaluate Possible Compounds
- Let’s consider possible candidates:
- **Compound A**: If it has a CO-CH3 group, it will give the iodoform test.
- **Compound B**: If it has a terminal alkyne, it will give Tollen's test.
- **Compound C**: If it has an aldehyde group, it will give Tollen's test.
- **Compound D**: If it has a phenolic group and does not have an aldehyde or terminal alkyne, it will meet all criteria.

### Step 5: Conclusion
- After evaluating the compounds based on the tests:
- **Compound D** is the only one that gives positive results for the iodoform test, bromine water test, and FeCl3 test but does not give a positive Tollen's test.

### Final Answer
The compound that meets all the criteria is **Compound D**.

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