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MCQMediumJEE Main 2026 · 23 January, Shift 2Alkynes (Acidic Nature, Reactions)

Chemistry Question from JEE Main 2026 · 23 January, Shift 2

Cyclopentane ring bearing two bromine substituents on adjacent top carbons and a methyl substituent on the lower right carbon, followed by reagents Zn with heat and then HBr, asking to identify P as the major product precursor.

Identify (P)

  • A
    Cyclopentane ring with a methyl substituent on the left carbon and both bromine and methyl attached to the top right carbon, representing 1-bromo-1-methylcyclopentane skeleton.
  • B
    Cyclopentane ring with bromine and an alkyl substituent attached to the same left upper carbon and a methyl substituent on the right upper carbon.
  • C
    Cyclopentane ring with a methyl substituent on the left upper carbon, a bromine on the adjacent lower left carbon, and another methyl substituent on the right upper carbon.
  • D
    Cyclopentane ring with bromine on the top carbon, a methyl substituent on the left upper carbon, and another methyl substituent on the right upper carbon.

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