As per IUPAC rules, which one of the following groups, will be regarded as the principal functional group?

- C \equiv C -

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- O H

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- C N

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- C O O H

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Solution

The correct option is D $- C O O H$
As per IUPAC rules, out of the following groups, $- C O O H$ will be regarded as the principal functional group.
The order of priority for choosing the principal functional group is $- C O O H > - C N > - O H > - C \equiv C -$ .

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