Consider the following reaction:
$Alkene (A) \xrightarrow{KMnO_4, \Delta} CH_3CH_2COCH_3 + CH_3CH_2CH_2CH_2COOH$
$A$ is:

Diimide $(N_2H_2)$ is used to reduce the double bond of:

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R.$
Assertion $A :$ Treatment of bromine water with propene yields $1-$bromopropan$-2-$ol.
Reason $R:$ Attack of water on bromonium ion follows Markovnikov rule and results in $1-$bromopropan$-2-$ol.
In the light of the above statements,choose the most appropriate answer from the options given below:

Name the reaction,heating of $1,2-$dibromoethane with zinc powder?

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 the product of the following reaction?