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Hydrocarbons

JEE Main 2024 (Online) 29th January Morning ShiftMCQMedium📈 Topic in 27% papers+4−1
Ques. 1JEE Main 2024, 29 January (Morning Shift)

Identify product A and product B : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(1) [figure]

Solution

hν (light): free-radical substitution at the allylic C–H positions; the C=C is retained.

∵ The allylic radical is resonance-stabilised.

[figure]

CCl4 (dark, inert solvent): electrophilic addition of Cl2 across C=C (via cyclic chloronium ion) ⇒ vicinal dichloride.

[figure]

Answer: (1)

Keep practising — Hydrocarbons

Ques. 2JEE Main 2024, 29 January (Morning Shift)

[figure] Consider the given reaction. The total number of oxygen atom/s present per molecule of the product (P) is .

Ques. 3JEE Main 2024, 29 January (Evening Shift)

Which of the following reaction is correct?

  1. C2H5CONH2 + Br2 + NaOH C2H5CH2NH2 + Na2CO3 + NaBr + H2O
  2. [figure]
  3. [figure]
  4. CH3CH2CH2NH2 [H2O]HNO2, 0 C CH3CH2OH + N2 + HCl
Ques. 4JEE Main 2024, 27 January (Morning Shift)

Among the following, total number of meta directing functional groups is (Integer based) -OCH3, -NO2, -CN, -CH3, -NHCOCH3, -COR, -OH, -COOH, -Cl

Ques. 5JEE Main 2024, 27 January (Evening Shift)

The incorrect statement regarding conformations of ethane is :

  1. The dihedral angle in staggered conformation is 60 .
  2. Ethane has infinite number of conformations.
  3. Eclipsed conformation is the most stable conformation.
  4. The conformations of ethane are inter-convertible to one-another.

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