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JEE MAIN 2026 · Some Basic Principles of Organic Chemistry

JEE Main 2026 Session 2 Question Paper: 8 Apr, Shift 2 (B.E./B.Tech), question 63

Updated
Single correct+4 / -1Answer matches NTA’s final key

The major product of which of the following reaction is not obtained by rearrangement reaction?

Choose one

Solution

Solution

Look at the carbocation each reaction goes through.

  • (A) 1-Chloropropane with AlCl3_3 gives a primary propyl cation, which shifts a hydride to become the secondary isopropyl cation. The product, cumene, comes from rearrangement.
  • (B) tert-Butyl alcohol loses water to give the tertiary tert-butyl cation directly. It is already the most stable cation possible, so it simply loses a proton: 2-methylpropene. No rearrangement.
  • (C) AlCl3_3/HCl isomerises n-hexane to branched 2-methylpentane by carbocation shifts.
  • (D) Neopentyl alcohol would give a primary cation; a methyl shift turns it into a tertiary cation, which loses a proton to give 2-methylbut-2-ene.

Answer: (B).

Answer checked against the official answer key. The solution is our own working.

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