Question

Why is the answer C and how do we name benzene rings like what are ALL the rules and why do we start from that specific substituent. Please I need a full explanation

9 What is the IUPAC name of the following compound? NO A) 4-bromo-1-nitrotoluene B) 4-nitro-1-bromotoluene C) 1-bromo-4-nitro

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Answer #1

In this case, there are two substituents on the benzene ring i.e. Bromine and Nitro group. while giving the numbering, the carbon which contains highest atomic number atom among the substituent will be considered 1, then other substituent will be numbered relative to this carbon.

In the given molecule, Bromine has the highest atomic number than nitrogen, therefore the carbon attached to bromine get priority and considered as 1. relative to this carbon Nitro group comes at 4th position.

Therefore, the name of the compound is,

C) 1-Bromo-4-Nitrobenzene

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