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yes Sourav
The Darzens reaction (also known as the Darzens condensation or glycidic ester condensation) is the chemical reaction of a ketone or aldehyde with an α-haloester in the presence of a base to form an α,β-epoxy ester,
and why does this rxn in qs given inside darzen
it's an application of the same
it is quite confusing being under darzen, there is no alpha ester
see you should keep in mind that you have to remove Br
And in the process epoxide has to form
which side ring opening of epoxide happen?
Read this
See the size of ring formation
4 membered from one side & 5 memberd from other side . Now you decide