Write the structure of the aldol condensation product of each of the aldehydes in Problem...

Write the structure of the aldol condensation product of each of the aldehydes in Problem 18.4. One of these aldehydes can undergo aldol addition, but not aldol condensation. Which one? Why?

Sample Solution (a) Dehydration of the product of aldol addition of pentanal introduces the double bond between C-2 and C-3 to give an α,β-unsaturated aldehyde.