Complete the following reactions:
a.
The product (D) is?

Explanation

a.
b.
c.
d. `R_(2)CuLi` does not add to `(C=O)` bond but couples.

e. This is an example of `1,4-`addition or conjugate addition to an `alpha,beta-`unsaturated carbony1 compound.

f. It is an example of partial oxidation of `(CH_(3))` to `(-CHO)` (Etard type reaction). Only terminal `CH_(3)` is oxidised to `(-CHO)`.

Formation of acetral ester prevents further oxidation of the intermediate aldehyde to acid `(-COOH)` group.
g.
h. It is an example of Gattermann-Koch synthesis. The reaction takes place at `rho-`position.

i.