$But-1-ene$ may be converted to $butane$ by reaction with:

The reaction of bromine with an alkene is an example of which of the following?

$HO - CH_2 - CH_2 - CH_2 - CH_2 - CH = CH_2 \xrightarrow{Br_2} \text{Product ?}$

The reaction is given as:
$(CH_3)_2C=C(CH_3)_2 + (CH_3)_3N^{+}-O^{-} + H_2O \xrightarrow{OsO_4 (10^{-4} \text{ mole})} A + (CH_3)_3N$
Product $(A)$ is:

The major product of the following reaction sequence is:

What is the product formed when $trans-2$-butene reacts with $D_2$ in the presence of a $Ni$ catalyst?