Exam 2 Review
SI leader: Ian
Course: chem 331 Zhao
Exam 2 Review
Circle the correct answer (think carefully)
A. How man signals are present in the broadband decoupled C NMR spectrum of:
1. 6
2. 7
3. 8
4. 9
B. How many signals are present in the H NMR spectrum of
’
1) 3
2) 4
3) 5
4) 6
C. How many signals are present in the broadband-decoupled C NMR spectrum of
1)
8
2) 9
3) 10
4) 11
Exam 2 Review
SI leader: Ian
Course: chem 331 Zhao
Draw a structure provided that it fits the data presented
A. C8H9BrO
1H NMR
7.4 (2H, doublet)
7.2 (2H, doublet)
4.2 (1H, quartet)
2.5 (1H, broad singlet)
1.4 (3H, doublet)
Broadband decoupled 13C NMR
144.7
131.4
69.6
127.1
25.2
IR: 3500 cm-1(broad), 1100 cm-1
B. C9H10O2
H NMR
9.8 (1H, singlet)
7.8 (1H, triplet)
7.5 (1H, doublet)
7.4 (1H, singlet)
7.35 (1H, doublet)
3.8 ( 2H, quartet)
1.3 (3H, triplet)
C NMR
191.1, 158.0, 137.7, 129.2, 128.3, 120.4, 114.2, 64.6, 14.4
IR: 1697 cm^-1, 1100 cm^-1
Exam 2 Review
SI leader: Ian
Course: chem 331 Zhao
Determine whether the following are diastereomers, enantiomers, unrelated molecules, constitutional
isomers, or same molecules.
Exam 2 Review
SI leader: Ian
Course: chem 331 Zhao
Draw a structure of a molecule with the formula C4H7N that would show a characteristic IR absorption
at around 2240 cm^-1. ( No other significant peaks beyond 3050 cm^-1)
Draw a structure of a molecule with the formula C5H8O that would show a characteristic IR absorption
at around 1700 cm^-1.
Draw a structure of a molecule with the formula C4H8Br2O that would show the following
characteristics:
H NMR only two triplets
C NMR only two signals.
Exam 2 Review
SI leader: Ian
Course: chem 331 Zhao