What product(s)result from the Claisen condensation carried out with an equimolar mixture of ethyl acetate and ethyl propanoate?

Question

Quizplus · Accepted Answer

The Claisen condensation between ethyl acetate and ethyl propanoate can result in multiple products due to the presence of two different esters that can undergo self-condensation and cross-condensation. 
I. Ethyl 3-oxobutanoate (also known as ethyl acetoacetate) forms by intramolecular self-condensation of ethyl acetate.
II. Ethyl 2-methyl-3-oxobutanoate forms by intermolecular cross-condensation of ethyl acetate and ethyl propanoate.
III. Ethyl 2-oxobutanoate (also known as ethyl pyruvate) forms by intramolecular self-condensation of ethyl propanoate.
IV. Ethyl 3-methyl-2-oxobutanoate forms by intermolecular cross-condensation of ethyl propanoate and ethyl acetate.
Therefore, all of the choices are correct.

What Product(s)result from the Claisen Condensation Carried Out with an Equimolar