Question

How would integration distinguish the 1 H NMR spectra of the following compounds?

Short answer

• The integral ratio for the first compound is 2:9.
• The integral ratio for the second compound is 1:3.
• The integral ratio for the third compound is 1:2.

Step-by-step solution

Integration

Integration stands for the number of protons in one signal.The integral ratio can be calculated for the different kinds of protons.

• In the first compound, there are two types of protons. Two are connected with bromine atoms, and the remaining 9 are in the same environment. Hence the ratio is 2:9
• There are also two types of protons 2 connected to the right-hand side bromine in the second compound, and the remaining 6 are in the same surroundings. Hence, the integral ratio is 2:6 after divide both number by 2 is comes as 1:3.
• Two types of protons in third molecule 6 are connected to different bromine, and the remaining 3 are the same. Hence, the integral ratio is 3:6 after divide the both numbers by 3, it comes as 1:2.

Steps to calculate the integral ratio

• Identify the different kinds of protons in a molecule.
• The count of protons for each signal.
• Divide the digits by the smallest number.