$CH_2=CH-CH_3 + HBr \to ?$ What will be the product formed?

Addition of $HCl$ to propene in the presence of peroxides gives:

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

The addition of $HI$ to the double bond of propene gives isopropyl iodide as the major product because the addition proceeds through:

Isobutene,in the presence of $H_2SO_4$,forms a mixture of two isomeric alkenes $(C_8H_{16})$. The major alkene is

Give the chemical reactions for the following conversions:
$(1)$ Glyoxal from acetylene
$(2)$ Glycol from bromoethane