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Which compound reacts with propene to form tripropyl borane?

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in Chemistry – Class 12 by (188k points)
Which compound reacts with propene to form tripropyl borane?

(a) Borane

(b) Diborane

(c) Boric acid

(d) Sodium borohydride

I have been asked this question during an online exam.

My question is from Alcohols and Phenols topic in chapter Alcohols, Phenols and Ethers of Chemistry – Class 12

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Right answer is (b) Diborane

For explanation I would say: Diborane (B2H6) reacts with alkenes to give trialkyl boranes as a product of successive addition. Firstly, CH3CH2CH2(BH2) is formed which reacts with propene to give (CH3CH2CH2)2BH, which further reacts with propene to finally give (CH3CH2CH2)B, which is tripropyl borane.

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