Which of the following pairs of species are the major products formed by alpha-cleavage of 2-pentanone? The infrared spectrum of the compound with the mass spectrum shown below has strong absorbances at 1480cm1,1448cm1, and 737cm1. Molecular ion peak: M+=156. Which of the following structures is consistent with the data? Which of the following structures is consistent with the data? A B C D The infrared spectrum of the compound with the mass spectrum shown below lacks any significant absorption above 3000cm1. There is a distinct poak near 1740cm1 and another strong peak near 1200cm1. molecular ion: M=102. Which of the following structures is consistent with the data? Which of the following structures is consistent with the data? The first compound The fast compound The second compound The third compound