Total sum of $\alpha -H$ in major product(s) (alkene) of each of the following reactions.

(a) and (b) give Saytzeff products as the major products (the more substituted alkene) and (c) gives Hoffmann's product as the major product (the less substituted alkene).
(d) is a redox reaction where $Zn$ is oxidised and dihalide is reduced.