Which reaction has the lowest $\Delta G^{\ddagger}$ (Activation Energy)?

Given below are two statements:
Statement-$I$:
$trans$-But-$2$-ene upon treatment with $Br_2$ in $CCl_4$ gives the following product:
(Image provided)
Statement-$II$:
$cis$-But-$2$-ene upon treatment with alkaline $KMnO_4$ gives the following product:
(Image provided)
In the light of the above statements, choose the most appropriate answer from the options given below.

$CH_2=CH_2 \xrightarrow{Br_2/H_2O} A$. In the above reaction,the compound $A$ is:

Ozonolysis of an organic compound gives formaldehyde as one of the products. This confirms the presence of:

The number of $sp^3$ hybridized carbon atoms in cyclohexene is

Which process converts olefins into paraffins?