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To get the silicone \( \mathrm{R}_{3} \mathrm{Si}-\left(\mathrm{OSiR}_{2}\right) \mathrm{n}_{-}-\mathrm{SiR}_{3} \) having \( 4 \mathrm{Si}-\mathrm{O}-\mathrm{Si} \) linkage, the unit taken is
(A) 4 unit of \( \mathrm{R}_{2} \mathrm{SiCl}_{2} \) and 2 unit of \( \mathrm{R}_{3} \mathrm{SiCl} \)
(B) 2 unit of \( \mathrm{R}_{2} \mathrm{SiCl}_{2} \) and 2 unit of \( \mathrm{R}_{3} \mathrm{SiCl} \)
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(C) 3 unit of \( \mathrm{R}_{2} \mathrm{SiCl}_{2} \) and 2 unit of \( \mathrm{R}_{3} \mathrm{SiCl} \)
(D) 3 unit of \( \mathrm{R}_{3} \mathrm{SiCl} \) and 2 unit \( \mathrm{R}_{2} \mathrm{SiCl}_{2} \)
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