Which compound reacts with propene to form tripropyl borane?

Beryllium chloride

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Diborane

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Boric acid

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Sodium borohydride

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Solution

The correct option is B Diborane
Diborane $(B_{2} H_{6})$ reacts with alkenes to give trialkyl boranes as a product of successive addition. Firstly, $C H_{3} C H_{2} C H_{2} (B H_{2})$ is formed which reacts with propene to give $(C H_{3} C H_{2} C H_{2})_{2} B H,$ which further reacts with propene to finally give $(C H_{3} C H_{2} C H_{2})_{3} B$ , which is tripropyl borane.
Mechanism of this reaction:

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