total number of molecule which hydrolysed at room temperature and hybridization of central atom is `sp^(3)d` in transition state:
`C Cl_(4),SiCl_(4),NCl_(3),PCl_(3),AsCl_(3),SF_(6),P_(4)O_(6),P_(4)O_(10),SeF_(6)`

Explanation

To solve the question, we need to identify the total number of molecules that hydrolyze at room temperature and have a central atom with an `sp^3d` hybridization in the transition state from the given list of compounds:

1. **CCl₄**
2. **SiCl₄**
3. **NCl₃**
4. **PCl₃**
5. **AsCl₃**
6. **SF₆**
7. **P₄O₆**
8. **P₄O₁₀**
9. **SeF₆**

### Step-by-Step Solution:

**Step 1: Analyze each compound for hydrolysis at room temperature.**

- **CCl₄**: This molecule does not hydrolyze because carbon does not have vacant d-orbitals to accommodate water molecules for hydrolysis.

- **SiCl₄**: This molecule does hydrolyze. The reaction involves water attacking the silicon atom, leading to the formation of Si(OH)₄. The transition state has a trigonal bipyramidal geometry, indicating `sp^3d` hybridization.

- **NCl₃**: This molecule does not hydrolyze because nitrogen does not have vacant d-orbitals.

- **PCl₃**: This molecule does hydrolyze. Water attacks phosphorus, leading to the formation of HCl and a phosphorous hydroxide. The transition state also has `sp^3d` hybridization.

- **AsCl₃**: Similar to PCl₃, arsenic trichloride hydrolyzes in a similar manner, resulting in `sp^3d` hybridization in the transition state.

- **SF₆**: This molecule does not hydrolyze in the same way because it has six fluorine atoms, leading to `sp^3d^2` hybridization, which is not what we are looking for.

- **P₄O₆**: This molecule can undergo hydrolysis, and the transition state involves `sp^3d` hybridization.

- **P₄O₁₀**: Similar to P₄O₆, this molecule can also undergo hydrolysis, and the transition state involves `sp^3d` hybridization.

- **SeF₆**: This molecule does not hydrolyze in the same manner as it has six fluorine atoms, leading to `sp^3d^2` hybridization.

**Step 2: Count the molecules that hydrolyze and have `sp^3d` hybridization.**

From the analysis:
- Hydrolyzing molecules with `sp^3d` hybridization: SiCl₄, PCl₃, AsCl₃, P₄O₆, P₄O₁₀.

Total = 5 molecules.

### Final Answer:
The total number of molecules that hydrolyze at room temperature and have `sp^3d` hybridization in the transition state is **5**.

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