The number of the given compounds, which can form iodoform with alkali and iodine Diethyl ketone, Acetone, Ethyl chloride, Catechol, Resorcinol, Isopropyl alcohol, Acetophenone, Butanone, Laactic acid (`{:(COOH),("|"),(CH-OH),("|"),(CH_(3)):}`) and salicylic acid.

Answer

To determine the number of compounds that can form iodoform with alkali and iodine, we need to identify which of the given compounds contain the functional groups necessary for the iodoform reaction. The compounds that can give a positive iodoform test are those that have either a methyl ketone group (RCOCH3) or a secondary alcohol group adjacent to a methyl group (RCHOHCH3).

Let's analyze each compound step by step:

1. **Diethyl ketone (C4H8O)**:
- Structure: CH3CH2COCH2CH3
- This is not a methyl ketone (it does not have the structure RCOCH3).
- **Conclusion**: Does not form iodoform.

2. **Acetone (C3H6O)**:
- Structure: CH3COCH3
- This is a methyl ketone.
- **Conclusion**: Forms iodoform.

3. **Ethyl chloride (C2H5Cl)**:
- Structure: C2H5Cl
- There is no ketone or alcohol group present.
- **Conclusion**: Does not form iodoform.

4. **Catechol (C6H6O2)**:
- Structure: C6H4(OH)2 (with hydroxyl groups on the benzene ring)
- Does not have the required functional groups for iodoform.
- **Conclusion**: Does not form iodoform.

5. **Resorcinol (C6H6O2)**:
- Structure: C6H4(OH)2 (similar to catechol)
- Does not have the required functional groups for iodoform.
- **Conclusion**: Does not form iodoform.

6. **Isopropyl alcohol (C3H8O)**:
- Structure: CH3CHOHCH3
- This has the structure RCHOHCH3 (secondary alcohol).
- **Conclusion**: Forms iodoform.

7. **Acetophenone (C8H8O)**:
- Structure: C6H5COCH3
- This is a methyl ketone.
- **Conclusion**: Forms iodoform.

8. **Butanone (C4H8O)**:
- Structure: CH3COCH2CH3
- This is a methyl ketone.
- **Conclusion**: Forms iodoform.

9. **Lactic acid (C3H6O3)**:
- Structure: CH3CHOHCOOH
- This has the structure RCHOHCH3 (secondary alcohol).
- **Conclusion**: Forms iodoform.

10. **Salicylic acid (C7H6O3)**:
- Structure: C6H4(OH)COOH
- Does not have the required functional groups for iodoform.
- **Conclusion**: Does not form iodoform.

Now, let's summarize the findings:

- Compounds that form iodoform: Acetone, Isopropyl alcohol, Acetophenone, Butanone, Lactic acid.
- Total number of compounds that can form iodoform: **5**.

### Final Answer:
The number of given compounds that can form iodoform is **5**.