The major product of the reaction of $2$-butene with alkaline $KMnO_4$ solution is

Which of the following bromides is the major product of the reaction shown below,assuming that there are no carbocation rearrangement?

When $but-1-ene$ is mixed with an excess of bromine,the expected reaction product is:

The correct structure of the product $A$ formed in the reaction shown below is:
$Cyclohex-2-en-1-one \xrightarrow[{Pd/C, \text{ ethanol}}]{{H_2 \text{ (gas, 1 atm)}}} A$

The metal used for the de-bromination reaction of $1, 2$-dibromoethane is:

$LDA = \text{Lithium di-isopropyl amide}$. In the given reaction,identify product $A$: