$H_2O_2$ on reacting with ethene gives:

$A$ compound $X$ absorbs $2$ moles of hydrogen and $X$ upon oxidation with $KMnO_4 \mid H^{+}$ gives the products shown below:
$CH_3-CO-CH_3$,$CH_3-COOH$ and $CH_3-CO-CH_2-CH_2-COOH$.
The total number of $\sigma$ bonds present in the compound $X$ is . . . . . .

An alkene on ozonolysis gave acetaldehyde. The alkene is:

Identify $Z$ in the following reaction sequence:
${C_2}{H_5}I$ $\xrightarrow{Alc. KOH} X$ $\xrightarrow{Br_2} Y$ $\xrightarrow{KCN} Z$

Isobutene in the presence of dilute $H_2SO_4$ forms an alcohol. The major product is

Presence of peroxides affects the addition of