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Which group is always taken as a substit...

Which group is always taken as a substituent in the `IUPAC` system of nomenclauture ?

A

`-NO_(2)`

B

`- C -= N`

C

D

`-NH_(2)`

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The correct Answer is:
A
Self-explanatory.
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CENGAGE CHEMISTRY ENGLISH-CLASSIFICATION AND NOMENCLATURE OF ORGANIC COMPOUNDS-Single correct Answer Type
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