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Hydrocarbons · Question 3

JEE Advanced 2019Multiple CorrectHard📈 Topic in 0% papers+4−1
1

Which of the following are aromatic?

  1. Benzene
  2. Cyclopentadienyl anion
  3. Cyclooctatetraene
  4. Tropylium cation

Answer

(1) Benzene, (2) Cyclopentadienyl anion, (4) Tropylium cation

Solution

JEE Advanced 2019

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2

Treatment of buta-1,3-diyne with NaNH2 (2 equivalents), followed by reaction with excess of trans- CH3-CH=CH-CH2-Br gives X as the major product. The maximum number of carbon atoms that are collinear (in a straight line) in X is .

JEE Advanced 2026 Paper 1
3

In the following reaction sequence, the major product Q is L-Glucose [ii) Cr2O3, 775 K, 10-20 atm]i) HI, P [UV]Cl2 (excess) Q

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  4. [figure]
JEE Advanced 2024 Paper 2

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