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Which nomenclature is not according to IUPAC system?
A
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B
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C
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D
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Detailed Solution
When a double bond and a halogen are both present, the double bond gets the lower number.
$Br-CH_2-CH=CH_2$ is numbered from the double-bond end: $CH_2=CH-CH_2Br$ is 3-bromoprop-1-ene.
So the name 1-bromo-prop-2-ene is not according to the IUPAC system; the other three names are correct.
$Br-CH_2-CH=CH_2$ is numbered from the double-bond end: $CH_2=CH-CH_2Br$ is 3-bromoprop-1-ene.
So the name 1-bromo-prop-2-ene is not according to the IUPAC system; the other three names are correct.