Ethylene reacts with 1% cold alkaline `KMnO_(4)` to form

Acetylene react with alkaline KMnO_(4) to give

How many isomers 'X' of C_(8)H_(10) given only aromatic dicarboxylic acid when react with hot alkaline KMNO_(4) . How many isomers 'Y' of C_(4)H_(8) give CO_(2) when reacts withh hot alkaline KMnO_(4) . Find the value of X+Y ?

But-2-ene on reaction with alkaline KMnO_(4) at elevated temperature followed by acidification will give :

What product is obtained when ethylbenzene is oxidised with alkaline KMnO_(4) ?

Ethylene reacts bromine to form-