Which is the M+1 peak? O O 40 O 42 SO 14 41 100- 80 8 Relative Intensity 40 20- 10 MS-NM-4393 15 20 25 m/z 30 35 40 Question 29 Which structures are those compounds that contain a benzene ring and have molecular ions in the mass spectrum at m/z = 132? O C O A E CN < NC. 3.33 pts NH CN g quo CN E Question 30 What is the expected coupling constant (Jbc) between the protons labeled Hb and Hc in the following molecule? O 12 05 Hb -O Hc 3.33 pts Question 32 Consider the structures given below. Which of them would be a resonance contributor formed in a Friedel-Crafts alkylation of benzene? Oll O III OIV OI O I. III. V II. R R R IV. V. I R H H H R 3.33 pts H Question 34 What is an IUPAC name: (2Z,4E,6E)-3,4,7,8-tetramethyl-2,4,6-Nonatriene O (2E,4Z,6E)-2,3,6,7-tetramethyl-3,5,7-Nonatriene O (2E,4E,6E)-3,4,7,8-tetramethyl-2,4,6-Nonatriene (2E,4Z,6E)-2,3,6,7-tetramethyl-3,5,7-Nonatriene O (2E,4Z,6E)-3,4,7,8-tetramethyl-2,4,6-Nonatriene