In the following reaction, the given product is the major product.

 

 

 

 

 

 

X can be

$\left(i\right) B_2{H}_6$ in THF; $\left(ii\right) C{H}_{3}C{O}_{2}H$

$\left(i\right) B_2{H}_6$ in THF; $\left(ii\right) H_2{O}_2/O{H}^{-}$

$H_2/N{i}_{\left(finelydividedstate\right)}$ at room temperature

$H_2/Pd-BaS{O}_4$