What series of steps could be used to carry out the transformation shown below
but-1-ene → Butyl cyanide
The Attempt at a Solution
This is a practice problem, so I already know that the answer is 1) HBr + Peroxide, 2) NaCN, but could it not also be BH3*THF and NaCN? My guess as to why that might not work is because Br is a much better leaving group than the boron group, but I just wanted to be sure.