Identify the alkadiene molecule from the following.

$HCl$ does not follow the anti-Markovnikov rule because...

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.

Which of the following reactions is not exothermic?

How many moles of $BH_3$ are needed to react completely with $2 \ mol$ of $1$-pentene in a hydroboration-oxidation reaction?

Hydroboration-oxidation of but$-1-$ene forms