Propene when heated with chlorine at about $500 \, ^oC$ forms

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

What is the major product of the following reaction?

Assertion : $trans-but-2-ene$ on reaction with bromine forms a racemic mixture.
Reason : $trans-$Compound in $trans$ addition forms two types of stereoisomers.

Bayer's reagent used to detect olefinic double bond is

One mole of $2-$methylbuta$-1, 3-$diene on ozonolysis gives: