Question

Which compounds give a ¹H NMR spectrum with two signals in a ratio of 2:3?

a.

b.

c.

d.

Short answer

a. Gives a ¹H NMR spectrum with two signals in a ratio of 2:3.

b. Does not give a ¹H NMR spectrum with two signals in a ratio of 2:3.

c. Gives a ¹H NMR spectrum with two signals in a ratio of 2:3.

d. Gives a ¹H NMR spectrum with two signals in a ratio of 2:3.

Step-by-step solution

NMR Spectroscopy

Nuclear magnetic resonance spectroscopy uses the magnetic properties of certain nuclei, particularly the proton ¹H and ¹³C .

Recording the differences in the magnetic properties of such nuclei present in a molecular species under different environments gives information about the number of each type of such nuclei present, their position within the molecules, etc.

Integration ratio

An integration ratio of 2:3 indicates that two types of hydrogens are present in the compound, and the ratio of one type to another is 2:3.

To find which compounds give an 1H NMR spectrum with two signals in a ratio of 2:3

CH₃CH₂Cl

2 types of hydrogen atoms are present, and the ratio is 3:2. So it gives a NMR spectrum with two signals in a ratio of 2:3.

CH₃CH₂CH₃

2 types of hydrogen atoms are present, and the ratio is 6:2 or 3:1. So it does not give a NMR spectrum with two signals in a ratio of 2:3.

CH₃CH₂OCH₂CH₃

2 types of hydrogen atoms are present, and the ratio is 6:4 or 3:2. So it gives a NMR spectrum with two signals in a ratio of 2:3.

CH₃OCH₂CH₂OCH₃

2 types of hydrogen atoms are present, and the ratio is 6:4 or 3:2. So it gives a NMR spectrum with two signals in a ratio of 2:3.