Bertybassett
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Hello, how do you know which group is priority and comes first in naming e.g. 2 bromo 4 methyl pentane?


E.g. in 2,4,6 trinitromethylbenzene, why is nitro 2 4 6 and not 1 3 5, and why doesn't methyl have a 1? Why isn't methyl first if it's aplaphetically first compared to nitro? I'm so confused. How do you work this stuff out.


Thanks
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username3249896
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priority is carboxylic acid > ester > acid chloride > amide > aldehyde > ketone > alcohol > thiol > amine > alkene > alkyne > alkane > ether > alkyl halide > nitro
should be named in alpabetical order so bromo substituent before methyl

btw there are "-" (hyphen) between number and letter so "2-bromo-4-methylpentane" not "2 bromo 4 methyl pentane" <- wrong

also methylpentane is one word.

2,4,6-trinitromethylbenzene is a methylbenzene ring which has 3 nitro groups at position 2,4,6
methyl doesn't have a 1 cus it's understood that it's position one. you start with a methylbenzene ring and nitrate it at positions 2,4,6

try drawing a benzene ring with nitro groups at 2,4,6. you only have one position to put methyl in
Last edited by username3249896; 2 years ago
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Bertybassett
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(Original post by BobbJo)
priority is carboxylic acid > ester > acid chloride > amide > aldehyde > ketone > alcohol > thiol > amine > alkene > alkyne > alkane > ether > alkyl halide > nitro
should be named in alpabetical order so bromo substituent before methyl

btw there are "-" (hyphen) between number and letter so "2-bromo-4-methylpentane" not "2 bromo 4 methyl pentane" <- wrong

also methylpentane is one word.

2,4,6-trinitromethylbenzene is a methylbenzene ring which has 3 nitro groups at position 2,4,6
methyl doesn't have a 1 cus it's understood that it's position one. you start with a methylbenzene ring and nitrate it at positions 2,4,6

try drawing a benzene ring with nitro groups at 2,4,6. you only have one position to put methyl in
but why is it 2-bromo 4-methylpentane and not 4-bromo 2-methyl pentane?
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username3249896
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(Original post by Bertybassett)
but why is it 2-bromo 4-methylpentane and not 4-bromo 2-methyl pentane?
should be named in alpabetical order so bromo substituent before methyl
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