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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 27th January Morning ShiftMCQMedium📈 Topic in 7% papers+4−1
Ques. 1JEE Main 2024, 27 January (Morning Shift)

Which of the following has highly acidic hydrogen?

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

Answer

(4) [figure]

Solution

Most acidic H = α-H whose carbanion is best stabilised by resonance.

(D): CH2 lies between two C=O groups (active methylene):

CH3- O \|C- CH- O \|C-CH2-CH3

∵ the negative charge is delocalised onto both O atoms ⇒ most stable conjugate base

(A), (B), (C): every α-H is next to only one C=O ⇒ less stable carbanion

Answer: (4)

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Ques. 2JEE Main 2024, 27 January (Morning Shift)

Cyclohexene [figure] is type of an organic compound.

  1. Benzenoid aromatic
  2. Benzenoid non-aromatic
  3. Acyclic
  4. Alicyclic
Ques. 3JEE Main 2024, 27 January (Morning Shift)

IUPAC name of following compound (P) is: [figure]

  1. 1-Ethyl-5,5-dimethylcyclohexane
  2. 3-Ethyl-1,1-dimethylcyclohexane
  3. 1-Ethyl-3,3-dimethylcyclohexane
  4. 1,1-Dimethyl-3-ethylcyclohexane
Ques. 4JEE Main 2024, 27 January (Morning Shift)

Among the given organic compounds, the total number of aromatic compounds is [figure]

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

The order of relative stability of the contributing structure is : [figure] Choose the correct answer from the options given below :

  1. I = II = III
  2. I > II > III
  3. III > II > I
  4. II > I > III
Ques. 6JEE Main 2024, 27 January (Evening Shift)

Bond line formula of HOCH(CN)2 is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7JEE Main 2024, 27 January (Evening Shift)

The molecular formula of second homologue in the homologous series of mono carboxylic acids is

  1. C2H4O2
  2. C2H2O2
  3. CH2O
  4. C3H6O2

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