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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 29th January Morning ShiftMCQEasy📈 Topic in 17% papers+4−1
Ques. 1JEE Main 2024, 29 January (Morning Shift)

The interaction between bond and lone pair of electrons present on an adjacent atom is responsible for

  1. Resonance effect
  2. Electromeric effect
  3. Hyperconjugation
  4. Inductive effect

Answer

(1) Resonance effect

Solution

π bond conjugated with a lone pair on the adjacent atom ⇒ delocalisation of electrons:

CH2=CH- Cl CH2-CH= Cl

∵ This permanent delocalisation (π–lone pair conjugation) is the resonance (mesomeric) effect.

Hyperconjugation involves σ(C–H) bonds; electromeric effect is temporary; inductive effect acts through σ bonds.

Answer: (1)

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

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

Number of compounds among the following which contain sulphur as heteroatom is . Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine

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

According to IUPAC system, the compound [figure] is named as

  1. Cyclohex-2-en-1-ol
  2. 1-Hydroxyhex-2-ene
  3. Cyclohex-1-en-3-ol
  4. Cyclohex-1-en-2-ol
Ques. 4JEE 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
Ques. 5JEE Main 2024, 29 January (Evening Shift)

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

Ques. 6JEE Main 2024, 27 January (Morning Shift)

Which of the following is strongest Bronsted base?

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

Which of the following has highly acidic hydrogen?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8JEE 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. 9JEE 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. 10JEE Main 2024, 27 January (Morning Shift)

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

Ques. 11JEE 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

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