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MHT CET202519 Apr 2025Evening ShiftChemistryGeneral Organic ChemistryActual

What is IUPAC name of following compound?

Options

  1. A1-Bromo-1, 1-dimethylbut-2-ene
  2. B4-Bromo-4-methylpent-2-ene
  3. C2-Bromo-2-methylpent-3-ene
  4. D4-Bromo-4,4-dimethylbut-2-ene

Correct answer

B. 4-Bromo-4-methylpent-2-ene

Step-by-step solution

To determine the IUPAC name of CH₃ -CH=CH-C(CH₃ )₂ -Br , identify the longest carbon chain containing the double bond, which contains 5 atoms: CH₃ -CH=CH-C(CH₃ )₂ . The parent alkene is pentene. Numbering from left to right gives the double bond the lowest locant, between carbons 2 and 3: pent-2-ene. The substituents are bromo and methyl groups on carbon 4. Alphabetical order places 'bromo' before 'methyl': 4-bromo-4-methylpent-2-ene. Among the options, only 4-bromo-4-methylpent-2-ene correctly identifies both the

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