In the given reaction,what will be the structure of $Z$?

Alkene $(x)$ $\xrightarrow[\Delta ]{KMnO_4/H^+}$ gives the following products:
$x$ is

Propene on hydroboration followed by oxidation with alkaline peroxide forms.

The product $(A)$ formed in the following reaction sequence is :
$CH_3-C \equiv CH$ $\rightarrow[(ii) HCN]{(i) Hg^{2+}, H_2SO_4}$ $\xrightarrow[(iii) H_2 / Ni]{} (A)$

What is the product of the following reaction?
$1,2-\text{dimethylcyclopentene} \xrightarrow[2. NaHSO_3]{1. OsO_4} \text{Product}$

Which of the following compounds forms $1-$bromo$-1-$methylcyclohexane when treated with $HBr$?