MHT CET · Chemistry · General Organic Chemistry

Which functional group from following is considered as principal functional group if polyfunctional compound is to be named by IUPAC system?

A \(-\mathrm{CN}\)
B \(-\mathrm{OH}\)
C \(-\mathrm{C} \equiv \mathrm{C}-\)
D \(-\mathrm{COOH}\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(-\mathrm{COOH}\)

Step-by-step Solution

Detailed explanation

As per IUPAC rules, out of the following groups, -COOH will be regarded as the principal functional group.
The order of priority for choosing the principal functional group is \(-\mathrm{COOH} > -\mathrm{CN} > -\mathrm{OH} > -\mathrm{C} \equiv \mathrm{C}-\).

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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