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

### Step 1: Analyze the first statement
**Statement**: Diethyl ether gives ethyl iodide on reacting with HI.

- **Reaction**: Diethyl ether (C2H5OC2H5) reacts with HI.
- **Expected products**: When ethers react with HI, they typically yield an alcohol and an alkyl halide. For diethyl ether, the reaction would yield ethyl iodide (C2H5I) and ethanol (C2H5OH).
- **Conclusion**: This statement is true.

**Hint**: Remember that ethers generally yield an alcohol and an alkyl halide upon reaction with HI.

### Step 2: Analyze the second statement
**Statement**: Diethyl ether and methyl isopropyl ether are chain isomers.

- **Structures**:
- Diethyl ether: C2H5O C2H5
- Methyl isopropyl ether: CH3O(CH(CH3)2)
- **Isomer classification**: Chain isomers have the same molecular formula but differ in the arrangement of the carbon skeleton. However, diethyl ether and methyl isopropyl ether do not fit this definition; they are actually metamers (different arrangements of carbon atoms around the ether functional group).
- **Conclusion**: This statement is false.

**Hint**: Identify the difference between chain isomers and metamers based on the arrangement of carbon atoms around the functional group.

### Step 3: Analyze the third statement
**Statement**: Diethyl ether is a Lewis base.

- **Definition**: A Lewis base is a substance that can donate an electron pair to an electron-deficient species (electrophile).
- **Analysis**: Diethyl ether has lone pairs of electrons on the oxygen atom, which can be donated to electrophiles.
- **Conclusion**: This statement is true.

**Hint**: Recall the definition of Lewis bases and how lone pairs on atoms can participate in chemical reactions.

### Step 4: Analyze the fourth statement
**Statement**: Diethyl ether hydrolyzes to ethanol by dilute H2SO4.

- **Reaction**: When diethyl ether reacts with dilute H2SO4, it undergoes hydrolysis.
- **Expected products**: For symmetrical ethers like diethyl ether, hydrolysis yields two molecules of ethanol (C2H5OH).
- **Conclusion**: This statement is true.

**Hint**: Understand the hydrolysis process of ethers in the presence of dilute acids.

### Final Conclusion
After analyzing all statements, we find that the false statement is:

**False Statement**: Diethyl ether and methyl isopropyl ether are chain isomers.

### Summary
- The correct answer is the second statement (B): Diethyl ether and methyl isopropyl ether are chain isomers (this is false; they are metamers).