Write the complete mechanism of the base-catalyzed condensation followed by dehydration between formaldehyde and butanal.

Answer Option A

Mechanism of base-catalyzed crossed aldol condensation of formaldehyde and butanal.

Illustration of the aldol condensation mechanism between formaldehyde and butanal.

Detailed steps of the base-catalyzed condensation mechanism for formaldehyde and butanal.