Which of the following statements is/are wrong ?

Options

A. THF (tetrahydrofuran) is a stronger Lewis base than diethyl ether.
B. Diisopropyl ether is a stronger Lewis base than diethyl ether.
C. THF is a stronger Lewis base than DHF (dihydro-furan).
D. Furan is a stronger Lewis base than DHF.

Explanation

To determine which statements are wrong, we will evaluate each statement one by one based on the properties of the compounds mentioned.

### Step-by-Step Solution:

1. **Evaluate Statement A: "Tetrahydrofuran is a stronger Lewis base than diethyl ether."**
- **Analysis**: Tetrahydrofuran (THF) has two lone pairs on oxygen and less steric hindrance compared to diethyl ether, which has steric hindrance from two ethyl groups. The presence of steric hindrance in diethyl ether makes it a weaker Lewis base than THF.
- **Conclusion**: This statement is **correct**.

2. **Evaluate Statement B: "Diisopropyl ether is stronger than diethyl ether."**
- **Analysis**: Diisopropyl ether has more steric hindrance due to the presence of two isopropyl groups compared to diethyl ether, which has two ethyl groups. The increased steric hindrance in diisopropyl ether makes it a weaker Lewis base than diethyl ether.
- **Conclusion**: This statement is **wrong**.

3. **Evaluate Statement C: "Tetrahydrofuran is a stronger Lewis base than dihydrofuran."**
- **Analysis**: Dihydrofuran has a double bond, which means that the lone pairs on the oxygen are involved in resonance, reducing their availability for donation. In contrast, THF does not have this resonance effect, making its lone pairs more available for donation.
- **Conclusion**: This statement is **correct**.

4. **Evaluate Statement D: "Furan is stronger than dihydrofuran."**
- **Analysis**: Furan has two double bonds, which delocalize its lone pairs of electrons, making them less available for donation. Dihydrofuran, having one double bond, has less delocalization of its lone pairs, making it a stronger Lewis base than furan.
- **Conclusion**: This statement is **wrong**.

### Final Answer:
The wrong statements are **B and D**.