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Haloalkanes and Haloarenes

JEE Main 2024 (Online) 5th April Evening ShiftMCQEasy📈 Topic in 15% papers+4−1
Ques. 1JEE Main 2024, 5 April (Evening Shift)

Identify the major product in the following reaction. [figure]

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Answer

(2) [figure]

Solution

[figure]

∵ OH /ethanol (strong base) on a 3° bromide ⇒ β-elimination of HBr

Ring β-H lost ⇒ 1-methylcyclopentene (trisubstituted C=C, major)

CH3 β-H lost ⇒ methylenecyclopentane (disubstituted C=C, minor)

∵ Saytzeff rule: the more substituted alkene is the major product

Answer: (2)

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Ques. 2JEE Main 2024, 4 April (Morning Shift)

[figure] Identify B and C and how are A and C related?

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Ques. 3JEE Main 2024, 4 April (Morning Shift)

Identify the correct set of reagents or reaction conditions 'X' and 'Y' in the following set of transformation. CH3-CH2-CH2-Br 'X' Product 'Y' CH3- Br |CH-CH3

  1. X = dil.aq. NaOH, 20°C, Y = HBr/ acetic acid
  2. X = conc.alc. NaOH, 80°C, Y = Br2/CHCl3
  3. X = dil.aq. NaOH, 20°C, Y = Br2/CHCl3
  4. X = conc.alc. NaOH, 80°C, Y = HBr/ acetic acid
Ques. 4JEE Main 2024, 4 April (Evening Shift)

[figure] Product P is

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Ques. 5JEE Main 2024, 4 April (Evening Shift)

Find out the major product formed from the following reaction. [Me : –CH3] [figure]

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Ques. 6JEE Main 2024, 1 February (Morning Shift)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A) is correct but (R) is not correct
  2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
  3. (A) is not correct but (R) is correct
  4. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
Ques. 7JEE Main 2024, 1 February (Evening Shift)

Match List - I with List - II. Choose the correct answer from the options given below :

  1. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
  2. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  3. (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
  4. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
Ques. 8JEE Main 2024, 31 January (Morning Shift)

The product (C) in the below mentioned reaction is : CH3-CH2-CH2-Br [ ]KOH(alc) A HBr B [KOH(aq)] C

  1. Propan-1-ol
  2. Propyne
  3. Propan-2-ol
  4. Propene
Ques. 9JEE Main 2024, 31 January (Morning Shift)

[figure] The total number of hydrogen atoms in product A and product B is .

Ques. 10JEE Main 2024, 31 January (Evening Shift)

Identify structure of 2,3-dibromo-1-phenylpentane.

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Ques. 11JEE Main 2024, 31 January (Evening Shift)

Identify A and B in the following reaction sequence. [figure]

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