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Which process gives rise to a straight-chain polymer?

1. Hydrolysis of CH3SiCl3 followed by condensation polymerisation
2. Hydrolysis of (CH3)2SiCl2 followed by addition polymerisation
3. Hydrolysis of (CH3)2SiCl2 followed by condensation polymerisation
4. Hydrolysis of (CH3)3SiCl followed by condensation polymerisation

Correct answer: Hydrolysis of (CH3)2SiCl2 followed by condensation polymerisation

Solution

Hydrolysis of the difunctional (CH3)2SiCl2 followed by condensation polymerisation gives a linear (straight-chain) silicone. Silicones polymerise by condensation, not addition, so the stored option's mechanism is wrong.

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