Which of the following statements about the compound shown are correct? Use NCERT-style numbering.

AThe double bond carbons are C1 and C2 in the ring numbering.
BThe two methyl groups have locants 1 and 5.
CThe degree of unsaturation of the compound is 2.
DThe correct name is 2,4-dimethylcyclohexene.

Answer: A, B, C

The compound is 1,5-dimethylcyclohexene (C8H14, ring plus one C=C gives degree of unsaturation 2). The ring carbons of the double bond are C1 and C2; the methyl locants are {1,5} against {2,4} for the other direction, and 1 is lower at the first point of difference. So 2,4-dimethylcyclohexene is wrong.

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