12. Which alkene is most stable? a. I b. II c. III d. IV IV ။ e. V 13. The IUPAC name for diisobutylacetylene is a. 2,7-Dimethyl-4-octene b. 2,7-Dimethyl-4-octyne c. 3,6-Dimethyl-4-octyne d. 2,5-Diethyl-3-hexyne e. 2,2,5,5-Tetramethyl-3-hexyne