49. Which type of precursor is used as reactant in intramolecular Claisen
condensation?
O One molecule with an ester end
O Two molecules of ester
O One molecule with two ester ends
O One molecule of ester and enolate​

C.One molecules with two ester ends

Explanation: In intramolecular Claisen condensations, reactions occur for 1,6 and 1,7 diesters, as these substances result in the formation of compounds containing five and six membered rings, respectively.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

explanation: no but i do not usually comment