A-8.Write a stepwise mechanism for the formation of CH3CH(OCH3)2from acetaldehyde andmethanol under conditions of acid catalysis.A-9.Suggest a structure for an unknown compound, C9H10O, that exhibits a strong infrared ab-sorption at 1710 cm21and has a1H NMR spectrum that consists of three singlets atd2.1 ppm(3H), 3.7 ppm (2H), and 7.2 ppm (5H).PART BB-1.Which of the compounds shown is (are) correctly named as pentane derivatives, either aspentanals or pentanones?(a)1 only(b)2 only(c)3 only(d)1 and 3(e)None of themB-2.The compound shown is best classifed as a(an)(a)Carbinolamine(d)Imine(b)Enamine(e)Oxime(c)HydrazoneB-3.When a nucleophile encounters a ketone, the site of attack is(a)The carbon atom of the carbonyl(b)The oxygen atom of the carbonyl(c)Both the carbon and oxygen atoms, with equal probability
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