Identify "A" in the reaction

Identify X in the reaction,

Identify Z in the reaction : C_(2)H_(5)Ioverset("alc. KOH")rarrXoverset(Br_(2))rarrYoverset(KCN)rarrZ

Identify the reaction that does not take place in a blast furnace.

Given is the energy profile diagram of nitration of benzene using mixed acid. (HNO_3 + H_2SO_4) Identify (x) in above reaction :

Identify the reaction that doesn't take place during the smelting process of copper extraction

Identify the reaction order from each of the following rate constants. (i) k = 2.3 xx 10^(-3) L mol^(-1)s^(-1) (ii) k = 3 xx 10^(-1)s^(-1)