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Hydrocarbons question

2016 · Shift 2 · Q14
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Hydrocarbons question

2016 · Shift 2 · Q14

JEE AdvancedChemistryHydrocarbonsMultiple correct+4 / −2
Among the following reaction(s), which gives(give) tert-butyl benzene as the major product is(are)
  1. A
    JEE Advanced 2016 Paper 2 Offline Chemistry - Hydrocarbons Question 19 English Option 1
  2. B
    JEE Advanced 2016 Paper 2 Offline Chemistry - Hydrocarbons Question 19 English Option 2
  3. C
    JEE Advanced 2016 Paper 2 Offline Chemistry - Hydrocarbons Question 19 English Option 3
  4. D
    JEE Advanced 2016 Paper 2 Offline Chemistry - Hydrocarbons Question 19 English Option 4
View written solutionFree

Correct answer: B, C, D

The question asks which reaction(s) give tert-butyl benzene as the major product, but the actual reaction schemes for options A, B, C, D are missing from the prompt.

Since this is an organic chemistry reaction-identification question, the answer depends entirely on the specific reagents/conditions in each option. Without the structures/reaction conditions, it is not possible to independently derive which options produce tert-butyl benzene.

What would normally be checked

To determine whether tert-butyl benzene is formed as the major product, we would examine whether the reaction generates a tert-butyl electrophile/radical or whether rearrangement leads to the tert-butyl-substituted aromatic product. Typical relevant cases include:

  1. Friedel–Crafts alkylation using a tert-butyl halide/alcohol/alkene in the presence of a Lewis or Brønsted acid.
  2. Rearrangement-prone carbocation conditions where a less stable carbocation rearranges to a tert-butyl cation before electrophilic substitution.
  3. Reactions involving isobutylene + acid with benzene.
  4. Conditions where polyalkylation or rearrangement affect the major product.

Limitation

Because the actual option details are absent, I cannot verify A/B/C/D rigorously.

Comparison with stored answer

The stored correct answer is B, C, D, but since the reaction schemes are not provided, I cannot honestly confirm or refute that from first principles.

Please provide the reaction schemes/options A–D (image or text), and I can solve it step-by-step properly.

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