Baeyer's reagent is used for the detection of

Identify the correct statements with respect to $cis/trans$-but$-2$-ene from the following:
$I$. $cis$-but$-2$-ene is more polar than $trans$-but$-2$-ene
$II$. Melting point of $cis$-but$-2$-ene is greater than that of $trans$-but$-2$-ene
$III$. Boiling point of $cis$-but$-2$-ene is greater than that of $trans$-but$-2$-ene
Correct answer is

The reaction of isobutene with $HBr$ yields:

The compound formed by passing ethylene gas into a cold alkaline solution of $KMnO_4$ is:

$cis-3-hexene \xrightarrow{(a)} \text{meso } 3,4-hexanediol$
$trans-3-hexene \xrightarrow{(b)} \text{meso } 3,4-hexanediol$
Choose the pair of reagents $(a, b)$ for the above conversions.

What are $X$ and $Y$ in the following reaction? $Hex-2-ene$ $\xrightarrow{O_3} \text{Ozonide}$ $\xrightarrow{Zn + H_2O} X + Y$