This reaction takes place between two molecules of esters (same or different). One ester should have atleast one `alpha`-hydrogen atom which behaves as a reagent. The reaction is catalyzed by strong bas elike `C_(2)H_(5)barONa^(+)` in presence of `C_(2)H_(5)OH`. The product of this reaction is `beta`-ketoster:
When two esters having `alpha`-hydrogen are subjected to Claisen condensation then we get:
A. 4 cross products
B. 2 simple and 2 cross products
C. 3 cross products and 1 simple products
D. 4 simple products
