What is the major product of the following reaction?

Which of the following alkenes will give $CH_3CH_2CHO$ and $CH_3COCH_3$ upon ozonolysis?

In the reaction of hydrogen bromide with an alkene (in the absence of peroxides),the first step of the reaction is the ................. to the alkene.

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

Alkene $(x) \xrightarrow[\Delta]{KMnO_4/H^+} \text{Products}$. Identify the alkene $(x)$ from the given products:

Ozonolysis of an alkene with molecular formula $C_{7}H_{14}$ in the presence of $Zn$ dust gives a mixture of acetone and $butan-2-one$. The $IUPAC$ name of the alkene is ..........