Deviation from Markownikoff's rule occurs in the presence of

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.

The alkene that gives only acetone upon ozonolysis is .......

Alkenes $(C=C)$ and carbonyl compounds $(C=O)$ both contain a $\pi$-bond,but alkenes show electrophilic addition reactions,whereas carbonyl compounds show nucleophilic addition reactions. Explain.

The product of the following reaction is:
$CH_3CH_2CH_2CH=CH_2 \xrightarrow[(ii) H_2O_2, OH^-]{(i) BH_3/THF} \text{Product}$

Explain the addition of $H_2O$ to an alkene.