Straight chain polymer is formed by hydrolysis of `[x]` which is tetrasubstituted chloromethylsilane then followed by condensation polymerization. Atomicity of `[x]` is:

Answer

To solve the problem, we need to determine the atomicity of the compound `[x]`, which is a tetrasubstituted chloromethylsilane. Here’s a step-by-step breakdown of the solution:

### Step 1: Identify the Structure of `[x]`
- The compound `[x]` is described as a tetrasubstituted chloromethylsilane. This means it has a silicon (Si) atom bonded to four substituents, which include chloromethyl (–CH2Cl) and methyl (–CH3) groups.
- A common structure for such a compound is Si(CH3)4, which means silicon is bonded to four methyl groups, but since it is tetrasubstituted with chloromethyl, we can assume a structure like Si(CH3)3(CH2Cl).

### Step 2: Write the Molecular Formula
- The molecular formula for `[x]` can be derived from its structure.
- For Si(CH3)3(CH2Cl), we have:
- 1 Silicon (Si)
- 3 Methyl groups (CH3) contribute 3 Carbon (C) and 9 Hydrogen (H)
- 1 Chloromethyl group (CH2Cl) contributes 1 Carbon (C), 2 Hydrogen (H), and 1 Chlorine (Cl)
- Thus, the total components are:
- Silicon (Si): 1
- Carbon (C): 3 (from CH3) + 1 (from CH2Cl) = 4
- Hydrogen (H): 9 (from CH3) + 2 (from CH2Cl) = 11
- Chlorine (Cl): 1

### Step 3: Calculate the Atomicity
- Atomicity is the total number of atoms in the molecule.
- From the components we identified:
- Silicon (Si): 1
- Carbon (C): 4
- Hydrogen (H): 11
- Chlorine (Cl): 1
- Now, we can sum these up:
- Total Atomicity = 1 (Si) + 4 (C) + 11 (H) + 1 (Cl) = 17

### Conclusion
- Therefore, the atomicity of the compound `[x]` is **17**.