Methods for Ester Synthesis

Q. What is the degree of unsaturation in the final product P?

Q. What is the degree of unsaturation in the final product P?

Q. Tischenko reaction yields ester in the presence of catalyst which is

1. $LiA{H}_4$

2. N-bromosuccinamide

3. $Al(O{C}_2{H}_5{)}_3$
4. Zn - Hg / HCl