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Order of Preference of Functional Groups

Which of the ...

Question

Which of the following groups is/are always taken as a substituent in IUPAC nomenclature of organic compounds?

A

$- N H_{2}$

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B

$-R or alkyl group$

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C

$(- O | | C - O - O | | C -)$

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D

$- N O_{2}$

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Solution

The correct option is C
$(- O | | C - O - O | | C -)$

a & c are not always treated as substituents!

b & d are always (No exceptions) treated as substituents

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