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 ether is a Lewis base
D. Diethyl ether hydrolysis 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 reaction with hydrogen iodide.

**Analysis:**
When diethyl ether (C2H5O-C2H5) reacts with hydrogen iodide (HI), it undergoes cleavage to form ethyl iodide (C2H5I) and ethanol (C2H5OH). Therefore, this statement is true.

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

**Analysis:**
Diethyl ether (C2H5O-C2H5) and methyl isopropyl ether (C3H8O) are not chain isomers. Chain isomers have the same molecular formula but differ in the arrangement of carbon atoms in the chain. Instead, these compounds are metamers because they have the same molecular formula but differ in the number of carbon atoms on either side of the functional group (oxygen). Therefore, this statement is false.

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

**Analysis:**
Diethyl ether has lone pairs of electrons on the oxygen atom, which allows it to donate electrons. A Lewis base is defined as a substance that can donate an electron pair. Therefore, this statement is true.

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

**Analysis:**
When diethyl ether reacts with dilute sulfuric acid, it hydrolyzes to form ethanol. This reaction is valid and confirms that the statement is true.

### Conclusion
After analyzing all the statements, we find that the second statement is false. Diethyl ether and methyl isopropyl ether are not chain isomers; they are metamers.

### Final Answer:
The false statement is: **Diethyl ether and methyl isopropyl ether are chain isomers.**

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