Answer: 143.3
137+115+104+263+98 divided by 5.Which gives us 143.3
Yo sup??
since A has a hydroxyl group ie OH therefore it's an alcohol
and since B has an oxygen between two carbons therefore it's an ether.
hence the correct answer is option B
A is alcohol and B is ether
Hope this helps
1) The metal which reduces the other compound is the one higher in the reactivity. So in this case it is
.
2) The substance which brings about reduction while itself getting oxidised (that is losing electrons) is called a reducing agent. Here, $\mathrm{Zn}$ is the reducing agent and reduces Cobalt Oxide to Cobalt while itself getting oxidised to Zinc oxide.