Question

what would be the correct order if Zn,Fe,Al and Cu are arranged in increasing order of reactivity?

Answer 1

Cu, Fe, Zn and Al is the correct order if all of these are arranged in their increasing order of reactivity.

In any reaction, Copper is the least reactive.

Then it is displaced by Iron.  

Zinc is more reactive than Iron which is displaced.

Then comes Aluminium which is highly reactive and is the most reactive of all elements. So the order will be Cu, Fe, Zn, Al.

Answer 2

Answer:

Cu, Fe, Zn and Al is the correct order if all of these are arranged in their increasing order of reactivity. In any reaction, Copper is the least reactive. ... Then comes Aluminium which is highly reactive and is the most reactive of all elements. So the order will be Cu, Fe, Zn, Al.