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Hydrocarbons

JEE Main 2024 (Online) 9th April Evening ShiftNumericalMedium📈 Topic in 20% papers+4
Ques. 1JEE Main 2024, 9 April (Evening Shift)

Number of compounds from the following which cannot undergo Friedel-Crafts reactions is: toluene, nitrobenzene, xylene, cumene, aniline, chlorobenzene, m-nitroaniline, m-dinitrobenzene

Answer

4

Solution

Friedel-Crafts reactions fail when the ring carries a strongly deactivating group (–NO2) or a basic –NH2 group, which forms a complex with the Lewis acid AlCl3 (N becomes positive and deactivates the ring).

Toluene, xylene and cumene (alkyl groups, activating) and chlorobenzene (only weakly deactivating) do react.

The compounds that cannot react are:

[figure]

∴ Number = 4

Answer: 4

Keep practising — Hydrocarbons

Ques. 2JEE Main 2024, 6 April (Morning Shift)

The major product of the following reaction is P. CH3C C - CH3 [ (ii) dil. KMnO4 \ 273 K](i) Na/liq. NH3 'P' Number of oxygen atoms present in product 'P' is . (nearest integer)

Ques. 3JEE Main 2024, 5 April (Morning Shift)

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

  1. Both Statement I and Statement II are incorrect
  2. Statement I is correct but Statement II is incorrect
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are correct
Ques. 4JEE Main 2024, 5 April (Evening Shift)

Consider the given chemical reaction : [figure] Product "A" is :

  1. picric acid
  2. oxalic acid
  3. adipic acid
  4. acetic acid
Ques. 5JEE Main 2024, 1 February (Morning Shift)

Which of the following compound will most easily be attacked by an electrophile?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2024, 1 February (Morning Shift)

Total number of deactivating groups in aromatic electrophilic substitution reaction among the following is . [figure]

Ques. 7JEE Main 2024, 1 February (Evening Shift)

In the given reactions identify A and B [figure] CH3-C C-CH3 + H2 Na/Liquid NH3 “B”

  1. A : n-Pentane B : Cis - 2 - butene
  2. A : 2-Pentyne B : Cis-2-butene
  3. A : n-Pentane B : trans-2-butene
  4. A : 2-Pentyne B : trans-2-butene
Ques. 8JEE Main 2024, 1 February (Evening Shift)

The set of meta directing functional groups from the following sets is :

  1. -CN, -NH2, -NHR, -OCH3
  2. -CN, -CHO, -NHCOCH3, -COOR
  3. -NO2, -NH2, -COOH, -COOR
  4. -NO2, -CHO, -SO3H, -COR
Ques. 9JEE Main 2024, 31 January (Morning Shift)

Number of alkanes obtained on electrolysis of a mixture of CH3COONa and C2H5COONa is .

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

Major product of the following reaction is - [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11JEE Main 2024, 31 January (Evening Shift)

The correct order of reactivity in electrophilic substitution reaction of the following compounds is : [figure]

  1. B > C > A > D
  2. B > A > C > D
  3. D > C > B > A
  4. A > B > C > D

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