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Question

Name the given aromatic compound according to IUPAC.

A
1-Nitro-4-Bromobenzene
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B
1-Bromo-4-nitrobenzene
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C
1-Bromonitrobenzene
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D
1-Nitrobromobenzene
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Solution

The correct option is B 1-Bromo-4-nitrobenzene
When present as substituents, -X (F, Cl, Br, I), NO2 are always used as prefixes. If more than one substituent is present, the chain is numbered from direction that will result in lowest possible number in the name of compound. Substituents are listed in alphabetical order (not numbered order).
So, the correct IUPAC name is 1-bromo-4-nitrobenzene.

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