Amongst the following, the maximum number of compounds which do not behave as Lewis acids are : `SnCl_(2),H_(3)BO_(3),AlCl_(3),CF_(4),SiF_(4),"CCl"_(4),BF_(3),SnCl_(4)`

Explanation

To determine which compounds do not behave as Lewis acids among the given options, we need to analyze each compound based on the definition of Lewis acids. A Lewis acid is a substance that can accept an electron pair.

Let's evaluate each compound:

1. **SnCl₂ (Tin(II) chloride)**: This compound can act as a Lewis acid because it can accept electron pairs due to the presence of a vacant p-orbital.

2. **H₃BO₃ (Boric acid)**: Boric acid does not behave as a Lewis acid in the traditional sense. It can accept electron pairs from hydroxide ions but is not a classic Lewis acid.

3. **AlCl₃ (Aluminum chloride)**: This compound is a well-known Lewis acid as it can accept electron pairs due to its electron deficiency.

4. **CF₄ (Carbon tetrafluoride)**: CF₄ does not have any empty orbitals and does not accept electron pairs, so it does not behave as a Lewis acid.

5. **SiF₄ (Silicon tetrafluoride)**: Similar to CF₄, SiF₄ does not have empty orbitals and does not act as a Lewis acid.

6. **CCl₄ (Carbon tetrachloride)**: Like CF₄, CCl₄ does not have any empty orbitals and does not accept electron pairs, so it does not behave as a Lewis acid.

7. **BF₃ (Boron trifluoride)**: This is a classic Lewis acid as it can accept electron pairs due to the electron deficiency of boron.

8. **SnCl₄ (Tin(IV) chloride)**: This compound can also act as a Lewis acid because it can accept electron pairs.

Now, let's summarize which compounds do not behave as Lewis acids:
- H₃BO₃
- CF₄
- SiF₄
- CCl₄

Thus, the maximum number of compounds that do not behave as Lewis acids from the given list is **4**.

### Final Answer:
The maximum number of compounds which do not behave as Lewis acids is **4**.