MHT CET · Chemistry · General Organic Chemistry

In assigning R-S configuration which among the following groups has highest priority?

A $- S O_{3} H$
B $- C O O H$
C $- C H O$
D $- C_{6} H_{5}$

Verified Solution

Answer & Solution

Correct Answer

(A) $- S O_{3} H$

Step-by-step Solution

Detailed explanation

In assigning $\mathrm{R}-\mathrm{S}$ configuration $-\mathrm{SO}_{3} \mathrm{H}$ group has highest priority.
The decreasing order of priority is $-\mathrm{SO}_{3} \mathrm{H}>-\mathrm{COOH}>-\mathrm{CHO}>-\mathrm{C}_{6} \mathrm{H}_{5}$.
Higher is the atomic number of the atom, higher is its priority. The atomic number of $\mathrm{S}$ is maximum. Hence, $-\mathrm{SO}_{3} \mathrm{H}$ group has highest priority.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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