Which of the following is a false statement ?

Options

A. Diethyl ether gives ethyl iodide on reacting with HI
B. Diethyl ether and methyl isopropyl ether are chain isomers
C. Diethyl ehter is a Lewis base
D. Diethytl ether hydrolyses to ethanol by dil . `H_(2) SO_(4)`

Answer

To solve the question, "Which of the following is a false statement?" regarding diethyl ether and its properties, we will analyze each option provided.

### Step-by-Step Solution:

1. **Analyze the First Option:**
- **Statement:** Diethyl ether gives ethyl iodide on reacting with HI.
- **Reaction:** Diethyl ether (C2H5)2O reacts with HI to yield ethyl iodide (C2H5I) and ethanol (C2H5OH).
- **Conclusion:** This statement is **true** as the reaction proceeds as expected.

2. **Analyze the Second Option:**
- **Statement:** Diethyl ether and methyl isopropyl ether are chain isomers.
- **Structure of Diethyl Ether:** C2H5O-C2H5.
- **Structure of Methyl Isopropyl Ether:** CH3-O-CH(CH3)2.
- **Conclusion:** These compounds are not chain isomers; they are metamers because they have different carbon atom arrangements around the ether functional group. Thus, this statement is **false**.

3. **Analyze the Third Option:**
- **Statement:** Diethyl ether is a Lewis base.
- **Definition of Lewis Base:** A Lewis base is a substance that can donate a pair of electrons.
- **Conclusion:** Diethyl ether has lone pairs on oxygen, which can act as a Lewis base. Therefore, this statement is **true**.

4. **Analyze the Fourth Option:**
- **Statement:** Diethyl ether hydrolyzes to ethanol by dilute H2SO4.
- **Reaction:** When diethyl ether reacts with dilute H2SO4, it hydrolyzes to form ethanol (C2H5OH).
- **Conclusion:** This statement is **true** as the reaction yields ethanol.

### Final Conclusion:
The false statement among the options is the second one, which claims that diethyl ether and methyl isopropyl ether are chain isomers.