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Which reaction involves the use of diborane (B₂H₆) in ether at 0°C?

1. 6 molecules of CH₃ — CH = CH₂ react with B₂H₆ in ether at 0°C.
2. 2 molecules of (CH₃CH₂CH₂)₃B react with water in the presence of OH⁻.
3. 6 molecules of CH₃CH₂CH₂OH combine with 2 molecules of H₃BO₃.
4. The compound formed is propanol.

Correct answer: 6 molecules of CH₃ — CH = CH₂ react with B₂H₆ in ether at 0°C.

Solution

The reaction involves diborane (B₂H₆) adding to alkenes (CH₃—CH=CH₂) in the presence of ether at 0°C, which is a hydroboration reaction.

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