Carbonyl IR spectroscopy Practice

1. The order of carbonyl stretching frequency in the IR spectra of ketone, amide, and anhydride is:

2. Match the compounds A-D with their carbonyl stretching frequencies (cm–1) I–VI in IR spectroscopy.

A. acetone                        I. 1870
B. ethyl acetate              II. 1800
C. acetamide                  III. 1740
D. acetyl chloride          IV. 1700
V. 1660
VI. 1600

3. In the IR spectrum, carbonyl absorption band for the following compound appears at

4. In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at

5. In IR spectra, the stretching frequency (in cm–1) of the carbonyl group of the following compounds is in the order

6. The order of carbonyl stretching frequency in the IR spectra of the following molecules respectively:

7. Identify the IR spectrum bands range of alpha halo ketone shown below

8. Identify the IR spectrum bands range of molecules A and B respectively:

9. Match the following IR spectrum data:

10. Identify the IR spectrum bands range of molecules A and B

11. Arrange the molecules given below increasing order of their IR C=O stretching:

a) D<C<F<E<B<A

b) D<C<F<E<A<B

c) C<D<F<E<B<A

d) C<D<E<F<A<B

Choose the correct option.

12. Identify the IR spectrum values for C=O in the following molecules respectively:

13. Arrange the following molecules in decreasing order of their C=O IR shifts:

14. Arrange the following molecules in decreasing order of their C=O IR shifts:

15.

Predict the frequency shift of the carbonyl absorption in the aldehydes  A to C: