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Question
Which of the following structure has incorrect IUPAC name:
Which of the following structure has incorrect IUPAC name:
2-bromo-5,5-dimethylcyclopent-3-en-1-one
3-methoxy-2-nitrocyclohex-1-ene
2-bromo-6-nitrobenzamide
5-chloro-5-oxopent-2-ynoic acid
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Solution
The correct options are
A 2-bromo-5,5-dimethylcyclopent-3-en-1-one
B 3-methoxy-2-nitrocyclohex-1-ene
C 2-bromo-6-nitrobenzamide
(a) Here principal functional group is ketone. Number the carbon so that alkene gets lowest locant. Then according to alphabetical order of substituents, number the carbon. Since "B" of Bromo alphabetically precedes the "M" of methyl. So the correct name is 5-bromo-2,2-dimethylcyclopent-3-en-1-one.
(b) Here alkene is primary functional group. Numbering should be done such that substitutent at doulb bond gets lowest locant.
(c) Here functional group is nitroso not nitro.
(d) Here principal functional group is acid.
A 2-bromo-5,5-dimethylcyclopent-3-en-1-one
B 3-methoxy-2-nitrocyclohex-1-ene
C 2-bromo-6-nitrobenzamide
(a) Here principal functional group is ketone. Number the carbon so that alkene gets lowest locant. Then according to alphabetical order of substituents, number the carbon. Since "B" of Bromo alphabetically precedes the "M" of methyl. So the correct name is 5-bromo-2,2-dimethylcyclopent-3-en-1-one.
(b) Here alkene is primary functional group. Numbering should be done such that substitutent at doulb bond gets lowest locant.
(c) Here functional group is nitroso not nitro.
(d) Here principal functional group is acid.
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