Which of the following is a false statement.

Options

A. The product of the reaction of ethyl iodide with silver cyanide is ethyl isocyanide
B. The formation of ether from the reaction of methyl iodide with dry `Ag_(2)`O is called Williamson’s synthesis
C. The test of chloroform is possible with Hofmann carbylamine reaction
D. Iodoform gives violet vapours on heating

Answer

To determine which of the following statements is false, we will analyze each statement one by one.

### Step 1: Analyze Statement 1
**Statement:** The product of the reaction of ethyl iodide with silver cyanide is ethyl isosynide.

- **Reaction:** Ethyl iodide (CH3CH2I) reacts with silver cyanide (AgCN).
- **Mechanism:** This is a nucleophilic substitution reaction where the cyanide ion (CN-) acts as a nucleophile. The nucleophilic attack occurs at the nitrogen atom of the cyanide.
- **Product:** The product formed is ethyl isosynide (CH3CH2NC). Therefore, this statement is **true**.

### Step 2: Analyze Statement 2
**Statement:** The formation of ether from the reaction of methyl iodide with dry AgO2 is called Williamson synthesis.

- **Williamson Synthesis:** This reaction involves the formation of ether from an alkyl halide (R-X) and an alkoxide (RO-).
- **Correct Reaction:** The correct reaction for Williamson synthesis would involve an alkoxide, such as sodium ethoxide (C2H5O-Na+), reacting with an alkyl halide like methyl iodide (CH3I).
- **Conclusion:** Since the statement incorrectly mentions "dry AgO2" instead of an alkoxide, this statement is **false**.

### Step 3: Analyze Statement 3
**Statement:** The test of chloroform is possible with the Hoffman carbolamine reaction.

- **Hoffman Carbolamine Reaction:** This reaction involves the reaction of primary amines with chloroform (CHCl3) in the presence of a base (like KOH) to produce isocyanides (RNC).
- **Conclusion:** This statement is **true** as it correctly describes the reaction.

### Step 4: Analyze Statement 4
**Statement:** Hydroform gives violet colour, violet vapours on heating.

- **Hydroform Test:** This test involves the reaction of a ketone with iodine in the presence of NaOH, leading to the formation of iodoform (CHI3).
- **Observation:** Iodoform is known to produce violet vapours when heated.
- **Conclusion:** This statement is **true**.

### Final Conclusion
After analyzing all the statements, we find that the **false statement** is:
- **Option 2:** The formation of ether from the reaction of methyl iodide with dry AgO2 is called Williamson synthesis.