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Haloalkanes and Haloarenes

JEE Main 2026 (Online) 5th April Evening ShiftNumericalMedium📈 Topic in 5% papers+4
Ques. 1JEE Main 2026, 5 April (Evening Shift)

RMgI when treated with ice cold water liberated a gas which occupied 1.4 dm3/g at STP. The gas produced is further reacted with iodine in presence of HIO3 to give compound (X). Compound (X) in presence of Na and dry ether produced compound (Y). Molar mass of compound (Y) is g mol-1. (Nearest integer)

Answer

30

Solution

RMgI + H2O → R–H + Mg(OH)I

1 g of gas occupies 1.4 dm3 at STP

⇒ molar mass = 22.41.4 = 16 g mol-1 ⇒ gas = CH4 (R = CH3)

Iodination (HIO3 removes HI and drives the reversible reaction forward):

CH4 + I2 CH3I + HI; 5HI + HIO3 3I2 + 3H2O ⇒ X = CH3I

Wurtz reaction: 2CH3I + 2Na dry ether CH3-CH3 + 2NaI ⇒ Y = ethane

Molar mass of Y = 2(12) + 6(1) = 30 g mol-1

Answer: 30

Keep practising — Haloalkanes and Haloarenes

Ques. 2JEE Main 2026, 4 April (Morning Shift)

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

  1. A-I, B-IV, C-III, D-II
  2. A-III, B-I, C-IV, D-II
  3. A-IV, B-II, C-I, D-III
  4. A-I, B-III, C-II, D-IV
Ques. 3JEE Main 2026, 2 April (Morning Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 4JEE Main 2026, 2 April (Evening Shift)

Correct statements regarding alkyl halides (R–X) among the following are : Choose the correct answer from the options given below :

  1. A, B and C Only
  2. B and D Only
  3. A and E Only
  4. D and E Only
Ques. 5JEE Main 2026, 28 January (Evening Shift)

Which of the following reactions is NOT correctly represented?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2026, 28 January (Evening Shift)

Identify the correct statements : The presence of -NO2 group in benzene ring Choose the correct answer from the options given below :

  1. A and D Only
  2. B and D Only
  3. C and A Only
  4. B and C Only
Ques. 7JEE Main 2026, 24 January (Morning Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below

  1. Statement I is false but Statement II is true
  2. Statement I is true but Statement II is false
  3. Both Statement I and Statement II are true
  4. Both Statement I and Statement II are false
Ques. 8JEE Main 2026, 24 January (Morning Shift)

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

  1. A-III, B-IV, C-I, D-II
  2. A-IV, B-I, C-III, D-II
  3. A-III, B-IV, C-II, D-I
  4. A-I, B-II, C-IV, D-III
Ques. 9JEE Main 2026, 22 January (Morning Shift)

As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene? Choose the correct answer from the options given below :

  1. B, C and E Only
  2. A, C and E Only
  3. B, C and D Only
  4. A, D and E Only
Ques. 10JEE Main 2026, 22 January (Morning Shift)

The correct order of the rate of reaction of the following reactants with nucleophile by SN1 mechanism is : (Given : Structures I and II are rigid) [figure]

  1. I < II < III < IV
  2. II < I < III < IV
  3. III < I < II < IV
  4. IV < III < II < I
Ques. 11JEE Main 2026, 22 January (Morning Shift)

The correct order of reactivity of CH3Br in methanol with the following nucleophiles is F-, I-, C2H5O- and C6H5O-

  1. I- > C2H5O- > C6H5O- > F-
  2. I- > F- > C6H5O- > C2H5O-
  3. I- > C6H5O- > F- > C2H5O-
  4. I- > C2H5O- > F- > C6H5O-

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