Question

Among the following hydrocarbon(s), how many of them would give rise to three groups of proton NMR peaks with 2:2:3 integration ratio? 

Hint:

In proton NMR, the integration ratio gives the relative number of protons in different environments in a molecule. A 2:2:3 ratio corresponds to three distinct groups of protons.

Answer 1

Correct Answer: 2

Step 1: Understanding proton NMR. 
In proton NMR (nuclear magnetic resonance), the chemical shifts and integration ratios of the peaks provide information about the number and types of protons in a molecule. The integration ratio reflects the relative number of protons in different environments. A 2:2:3 integration ratio corresponds to three sets of protons with relative ratios of 2 protons, 2 protons, and 3 protons. 
 

Step 2: Conclusion. 
The correct answer is 2 because two of the given hydrocarbons will give rise to a 2:2:3 integration ratio in proton NMR.