Question

The compound(s) which will have only two signals in the \( ^1 \text{H} \) NMR spectrum in 3:2 ratio is(are) 

 

• A. (A)
• B. (B)
• C. (C)
• D. (D)

Hint:

In \( ^1 \text{H} \) NMR, the signal intensity ratio corresponds to the number of protons in each distinct environment.

Answer 1

The Correct Option is C, D

Step 1: Understanding NMR spectra.
The \( ^1 \text{H} \) NMR spectrum shows the number of different proton environments in a compound, with the intensity ratio representing the relative number of protons in each environment. The 3:2 ratio indicates two distinct proton environments.

Step 2: Analyzing the options.
- Option (A): The compound shows two distinct proton environments in a 3:2 ratio, where the methyl group and the benzene ring give the expected intensities.
- Options (B), (C), and (D) do not show the correct intensity ratio based on the given proton environments.

Step 3: Conclusion.
The compound with two signals in a 3:2 ratio is (A).