What is produced when chlorine is passed through propene at $400\,^oC$?

Two isomers $A$ and $B$ with molecular formula $C_4H_8$ give different products on oxidation with $KMnO_4$ in acidic medium. Isomer $A$ on reaction with $KMnO_4 / H^{+}$ results in effervescence of a gas and gives a ketone. The compound $A$ is ...... .

Identify the major product $A$ and major product $B$ in the following set of reactions:
$CH_3-CH=CH_2 \xrightarrow{H_2O, H^+} \text{Major product } A$
$CH_3-CH=CH_2 \xrightarrow{(BH_3)_2, H_2O_2, OH^-} \text{Major product } B$

What is hydrogenation reaction?

$CH_3-CH(CH_3)-CH=CH_2 \xrightarrow{DBr} \text{Product (Major)}$. The product will be:

The boiling point (in $K$) of $cis-but-2-ene$ and dipole moment (in $D$) of $trans-but-2-ene$ are respectively: