How many signals would you expect to find in the ¹³C NMR spectrum of the following compounds?

Question

Quizplus · Accepted Answer

Based on the given compound formula, there are two distinct sets of protons: one set with chemical shifts between 0 and 3 ppm (designated as S1) and another set with chemical shifts between 11 and 13 ppm (designated as S2). Compound I has one S1 proton, one S2 proton, and one proton attached to a carbon (C) atom, leading to a total of 5 signals: ¹³C Compound II has two S1 protons, one of which is split by the neighboring S2 proton, and two protons attached to carbon atoms (one with chemical shift between 1 and 2 ppm and the other with chemical shift between 2 and 3 ppm), leading to a total of 6 signals: ¹³C. Therefore, the best choice is D, which correctly identifies the number of signals for each compound.

How Many Signals Would You Expect to Find in the 13C

How Many Signals Would You Expect to Find in the ¹³C