Among the following, the group of molecules that undergoes rapid hydrolysis is

Options

A. `SF_(6), Al_(2)Cl_(6), SiMe_(4)`
B. `BCl_(3), SF_(6),SiCl_(4)`
C. `BCl_(3), SiCl_(4), PCl_(5)`
D. `SF_(6),Al_(2)Cl_(6),SiCl_(4)`

Answer

To determine which group of molecules undergoes rapid hydrolysis, we need to analyze the hydrolysis reactions of the given compounds. Hydrolysis is a reaction with water that often leads to the formation of acids or other products. Let's evaluate the compounds mentioned in the question step by step.

### Step 1: Identify the Compounds
The compounds mentioned in the video transcript include:
1. SF6 (Sulfur hexafluoride)
2. Al2Cl6 (Aluminum chloride)
3. SiMe4 (Silicon tetramethyl)
4. BCl3 (Boron trichloride)
5. SiCl4 (Silicon tetrachloride)
6. PCl5 (Phosphorus pentachloride)

### Step 2: Analyze Each Compound for Hydrolysis
- **SF6**: This compound is stable and does not undergo hydrolysis readily because the fluorine atoms are highly electronegative and do not allow for easy replacement by hydroxyl groups.

- **Al2Cl6**: This compound also does not undergo rapid hydrolysis. The aluminum-chlorine bonds are stable, and the structure does not favor hydrolysis.

- **SiMe4**: Silicon tetramethyl is not prone to hydrolysis because the methyl groups (Me) cannot be easily replaced by hydroxyl groups.

- **BCl3**: When BCl3 is added to water, it reacts rapidly to form boric acid (H3BO3) and hydrochloric acid (HCl). This indicates that BCl3 undergoes rapid hydrolysis.

- **SiCl4**: Silicon tetrachloride reacts with water to form silicic acid (H4SiO4) and hydrochloric acid (HCl). This is also a rapid hydrolysis reaction.

- **PCl5**: Phosphorus pentachloride reacts with water to first form phosphorus oxychloride (POCl3) and hydrochloric acid (HCl). Further hydrolysis of POCl3 leads to the formation of phosphoric acid (H3PO4) and more HCl. This indicates that PCl5 also undergoes rapid hydrolysis.

### Step 3: Conclusion
From the analysis, the compounds that undergo rapid hydrolysis are:
- BCl3
- SiCl4
- PCl5

Thus, the correct answer to the question is that the group of molecules that undergoes rapid hydrolysis includes BCl3, SiCl4, and PCl5.

### Final Answer
The group of molecules that undergoes rapid hydrolysis is **BCl3, SiCl4, and PCl5**.