Complete the following by suppling intermediates
`C_(6)H_(5)CH_(2)CH_(3) overset(KMnO_(4))underset(KOH, 373 K)(to) A overset(NaOH+ CaO)underset(630K) (to)B`

Explanation

`underset("Ethy lbenzene")(C_(6)H_(5)CH_(2)CH_(3)) underset("(Oxidatin)")overset(KMnO_(4).KOH, 373 K)(to) underset("Pot . benzoate (A) ")(C_(6)H_(5)COOk) overset(N/AOH+CaO.630K)underset(("Decarboxylation"))(to) underset("Benzene(B)")(C_(6)H_(6))`