The correct answer is: D. Q and S
An acylanion is a negatively charged anion with an acyl group attached to it. The acyl group is a functional group with the formula RCO-, where R is an alkyl group.
In the compounds P-S, the only compounds that have an acyl group attached to a negatively charged atom are Q and S. In Q, the acyl group is attached to a negatively charged oxygen atom. In S, the acyl group is attached to a negatively charged sulfur atom.
Therefore, the acylanion equivalents among the following compounds (P-S) are Q and S.
Here is a brief explanation of each option:
- Option A: P and Q
In P, the acyl group is attached to a positively charged nitrogen atom. In Q, the acyl group is attached to a negatively charged oxygen atom. Therefore, P and Q are not acylanion equivalents.
- Option B: Q and R
In Q, the acyl group is attached to a negatively charged oxygen atom. In R, the acyl group is attached to a positively charged carbon atom. Therefore, Q and R are not acylanion equivalents.
- Option C: P and S
In P, the acyl group is attached to a positively charged nitrogen atom. In S, the acyl group is attached to a negatively charged sulfur atom. Therefore, P and S are not acylanion equivalents.
- Option D: Q and S
In Q, the acyl group is attached to a negatively charged oxygen atom. In S, the acyl group is attached to a negatively charged sulfur atom. Therefore, Q and S are acylanion equivalents.