(21) (a) What is the conjugate base of acetylene, C2H2 ? (b) What is the conjugate acid of the amide anion, NH2? (22) For( E,E)2,5-octadiene (shown below), which CH bond has the lowest Bond Dissoclation Energy, BDE? (23) Propose a two-step synthetic sequence to prepare epoxycyclopentane from cyciopentanol, Be sure to include the reactions in the forward direction. from (24) What diene and dienophile could you use to prepare the following compound via a Diels-Alder reaction? (25) What is the IUPAC name of the following compound? (26) What is the product of the reaction of cyclopentene with each of the following? Be sure to include the stereochemistry of the product in each case. (a) Cl2/H2O (b) Cl2