Question:
Which from following functional groups has highest priority order for naming the polyfunctional group compounds?
Which from following functional groups has highest priority order for naming the polyfunctional group compounds?
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Recall the IUPAC seniority order of functional groups used to choose the principal group.
Updated On: Nov 13, 2026
- -COCl
- \(-\mathrm{SO}_{3}\mathrm{H}\)
- -CHO
- -OH
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
In polyfunctional compounds the principal functional group is chosen by a fixed seniority order.
Step 2: Order
Carboxylic acid > sulphonic acid > anhydride > ester > acid halide > amide > nitrile > aldehyde > ketone > alcohol.
Step 3: Compare the options
Among \(-\text{COCl}\), \(-\text{SO}_3\text{H}\), \(-\text{CHO}\) and \(-\text{OH}\), the sulphonic acid group ranks highest.
Final Answer:
The \(-\text{SO}_3\text{H}\) group has the highest priority. \[ \boxed{\text{(B) }-\mathrm{SO}_{3}\mathrm{H}} \]
In polyfunctional compounds the principal functional group is chosen by a fixed seniority order.
Step 2: Order
Carboxylic acid > sulphonic acid > anhydride > ester > acid halide > amide > nitrile > aldehyde > ketone > alcohol.
Step 3: Compare the options
Among \(-\text{COCl}\), \(-\text{SO}_3\text{H}\), \(-\text{CHO}\) and \(-\text{OH}\), the sulphonic acid group ranks highest.
Final Answer:
The \(-\text{SO}_3\text{H}\) group has the highest priority. \[ \boxed{\text{(B) }-\mathrm{SO}_{3}\mathrm{H}} \]
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