Which of the following is a correct name according to IUPAC conventions of the given compound?

1, 4-dimethylcyclohex-1-ene

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2, 3-dimethylcyclohexene

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1, 5-dimethylcyclohex-1-ene

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1, 6-dimethylcyclohex-1-ene

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Solution

The correct options are
A 1, 4-dimethylcyclohex-1-ene
B 2, 3-dimethylcyclohexene
According to IUPAC name, in case of substituted cycloalkenes, the double bond is given the lowest possible number and numbering is done in such a way that the substituents get the lowest number.
The correct name should be 2, 3-dimethylcyclohex-1-ene.
1,4-dimethylcyclohex-1-ene in option A is also correct as, during the numbering, the numbering is started from methyl group on double bond in the cyclohexene.

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