Let's review some concepts that were discussed in class today. Indicate whether the following statement is true or false. The more substituted the double bond, the more stable the alkenes thermodynamically. The 1,2-addition of HBr to 1,3 butadiene will be formed as the predominant product when the reaction is performed at high temperature. The two double bonds in 1,4pentadiene below cannot participate in resonance with each other, thereby they are not in conjugation. Possible resonance contributors must be carefully evaluated to help determine the hybridization of an atom. Because the pi bond is weaker than the sigma bond, the electron pair of the pi bond in alkenes can be used for protonation by strong acids