Aldol condensation between following compounds, followed by dehydration gives emthyl vinkyl ketone:

Base catalysed condensation between the following compounds followed by dehydration gives methyl vinly ketone :

Base catalysed condensation between the following compounds followed by dehydration gives methyl vinly ketone :

Aldol condesation between the following compounds followed by debydration given nethly vinyi ketone

Aldol condensation between the compounds followed by dehydration gives methyl vinyl ketone.