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Haloalkanes and Haloarenes

JEE Main 2024 (Online) 4th April Morning ShiftMCQEasy📈 Topic in 16% papers+4−1
Ques. 1JEE 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

Answer

(4) X = conc.alc. NaOH, 80°C, Y = HBr/ acetic acid

Solution

Required: 1-bromopropane → 2-bromopropane (Br shifts to C-2) ⇒ via propene

CH3CH2CH2Br [80 C]conc. alc. NaOH CH3CH=CH2 (E2, dehydrohalogenation)

CH3CH=CH2 HBr/CH3COOH CH3CHBrCH3 (Markovnikov addition)

(A), (C): dil. aq. NaOH, 20°C ⇒ substitution ⇒ CH3CH2CH2OH, not an alkene ⇒ wrong

(B): Br2/CHCl3 adds two Br ⇒ CH3CHBrCH2Br ⇒ wrong

(D): elimination, then HBr addition ⇒ correct

Answer: (4)

Keep practising — Haloalkanes and Haloarenes

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

[figure] Product P is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2024, 4 April (Evening Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4JEE 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. 5JEE 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. 6JEE 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. 7JEE Main 2024, 31 January (Morning Shift)

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

Ques. 8JEE Main 2024, 31 January (Evening Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE Main 2024, 31 January (Evening Shift)

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE Main 2024, 30 January (Morning Shift)

Example of vinylic halide is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11JEE Main 2024, 30 January (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 true but (R) is false
  2. (A) is false but (R) is true
  3. Both (A) and (R) are true but (R) is not the correct explanation of (A)
  4. Both (A) and (R) are true and (R) is the correct explanation of (A)

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