(i) What are silicones? State the uses of silicones.
(ii) What are boranes? Give chemical equation for the preparation of diborane.

Answers (1)

(i) Silicones are organosilicon polymers and have a repeating unit. The alkyl groups form silicones and the methyl chloride in the presence of the copper as a catalyst with silicon form Me_{4}Si. The straight-chain polymers are formed by condensation and polymerization.

Uses: - They are used in industries as greasing agents and sealants as well as insulators. They are also expensively employed in the cosmetic industry for surgical implants.

(ii) The binary forms of boron and hydrogen form alkanes and the covalent hybrids are called diborane.

4BF_{3} + 3LiAlH_{4} \rightarrow 2B_{2}H_6 + 3LiF + 3AlF_{3}

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