Question

pls tell this guys plss

Answer 1

Reversing the process of aldol condensation in the following manner, we get two moles of ethanal.

But−2−enalCH3​CH=CHCHO​H2​OHydration​β− hydroxy aldehyde  or aldol​CH3​C∣HOH−CH2​CHO​   Reversing​Ethanal2CH3​CHO​

Thus, the combination of compounds to give the given product is two moles of ethanal.