Supply the reagents in the following sequence of reations :
(i) `CH_(3)CH_(2)CH_(2)Br overset((A))(to) CH_(3) CH= CH_(2) overset((B))(to) CH_(3) CHBr - CH_(2) Br overset((C ))(to) CH_(3)-C -=CH overset((D))(to) CH_(3) -overset(O)overset(||)(C)-CH_(3)`

Explanation

`underset(1-"Bromopropane ")(CH_(3)CH_(2)CH_(2)Br) overset(KOH al. Delta [A])underset("(Dehydrobromiation)")(to) underset("Propene")(CH_(3)CH=CH_(2)) overset(Br_(2),CCI_(4)[B])(to) underset(1,2-"Dibromorpropane")(CH_(3)CH_(2)Br-CH_(2)Br)`
`overset(KOH alc. Delta [C])underset("(DehydrobromiN/Ation)")(to) underset("Propyne")(CH_(3) -C -=H) overset(" Dil. "H_(2)SO_(4), HgSO_(4) [D])underset(330k)(to) CH_(3) -overset(O)overset(||)(C) -CH_(3)`