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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 7% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

The ascending acidity order of the following H atoms is [figure]

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

Answer

(4) C < D < B < A

Solution

Acidity of C–H ∝ stability of the carbanion left after losing H+.

A: H on sp carbon (50% s) ⇒ HC C most stable ⇒ most acidic

B: H on sp² carbon (33% s) ⇒ H2C=CH next

D: H on sp³ 1° carbon ⇒ CH3CH2 (one +I group)

C: H on sp³ 3° carbon ⇒ (CH3)3C destabilised by three +I CH3 ⇒ least acidic

∴ C < D < B < A

Answer: (4)

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

The total number of 'Sigma' and 'Pi' bonds in 2-formylhex-4-enoic acid is .

Ques. 3JEE Main 2024, 27 January (Morning Shift)

Which of the following is strongest Bronsted base?

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

Which of the following has highly acidic hydrogen?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5JEE 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. 6JEE 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. 7JEE Main 2024, 27 January (Morning Shift)

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

Ques. 8JEE 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. 9JEE Main 2024, 27 January (Evening Shift)

Bond line formula of HOCH(CN)2 is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10JEE 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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