Question

Draw a diagram like the one shown in Figure 14.12 to predict;

a. the relative intensities of the peaks in a triplet.

b. the relative intensities of the peaks in a quintet.

Short answer

1. The peaks in a triplet has relative intensities of 1:2:1
2. The relative intensities of the peaks in quintet is 1:4:6:4:1.

Step-by-step solution

Step-by-Step SolutionStep 1: Intensity of peaks in the triplet

Triplet is caused by the coupling of two equivalent protons on an adjacent carbon.The two protons can be aligned in three different ways;

• Both with the field and one against the field.
• One with the field one against the field, or
• Both against the field.

That is why the signal is a triplet.

The peak in a triplet has relative intensities of 1:2:1.

Intensity of peaks in the quintet

A quintet is caused by coupling to four equivalent protons on the adjacent carbon.The four protons are arranged in five different ways. The relative intensities of the peaks in a quintet is 1:4:6:4:1.

Arrangement of protons