Question

The number of singlets observed in the 1H NMR spectrum of P is ____.

Answer 1

Correct Answer: 3

Analyzing the compound P, we need to determine the number of singlets in its ¹H NMR spectrum. Each unique proton environment generates a distinct signal. Here's the breakdown:

• OCH₃ Group: Methyl protons adjacent to an oxygen atom typically produce a singlet as there is no neighboring proton to cause splitting.
• Two CH₃ Groups: Each methyl group on the aromatic ring, being isolated from other hydrogen environments (due to the para relationship on the benzene ring and lack of neighboring protons), will produce a singlet. The symmetry ensures they are equivalent.

In total, three distinct singlets should be observed, fitting the expected range of 3,3.