Analysis

Question 1

How to use IR spec to check if 1-chloropentane has been converted to pentan-1-ol completely?
(2 marks)

Answer 1

1. Peak at 650-800 which shows C-Cl will disappear

2. Peak at 2500-3500 which shows OH will be present

Question 2

Difference between 13C NMR spec and 1H spec

Answer 2

Nothing can be deduced from peak size of 13C

Question 3

How to use mass spec? (3 marks)

Answer 3

1. Molecular ion peak
2. Mr
3. One/ two random fragment ions

Question 4

How to use 13C NMR spec? (2 marks)

Answer 4

1. How many diff carbon environments

2. Chemical shift shows presence of xxx

Question 5

How to use 1H NMR spec? (2 marks)

Answer 5

1. How many diff hydrogen environments (list the ratio of relative areas of peaks)
2. Shift deduces group

Question 6

How to use percentage by mass? (3 marks)

Answer 6

1. Percentage of each element present
2. Mole ratio
3. Empirical formula