Problems and exercisesBond Properties
1. Isolated, conjugated or cumulated?
Classify the double bonds of these compounds: a) 3-butenal; b) 2-butenal; c) ketene (CH2=C=O); d) 4-penten-2-one; e) 3-penten-2-one.
2. Stability by conjugation
3-Butenal is converted into 2-butenal in the presence of a catalytic amount of base. Why does the equilibrium lie towards 2-butenal? How does the isomerization take place?