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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 30th January Morning ShiftMCQEasy📈 Topic in 14% papers+4−1
Ques. 1JEE Main 2024, 30 January (Morning Shift)

Which of the following molecule/species is most stable?

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

Answer

(2) [figure]

Solution

Hückel rule: cyclic, planar, fully conjugated with (4n+2) electrons ⇒ aromatic (extra stable)

(A): one sp3 ring carbon ⇒ (A) is non-aromatic

(B): cyclopropenyl cation, 2 π electrons (n = 0) ⇒ (B) is aromatic

(C): cyclopentadienyl cation, 4 π electrons ⇒ (C) is antiaromatic

(D): 2 π electrons + lone pair in the ring = 4 electrons ⇒ (D) is antiaromatic

∴ (B) is the most stable

Answer: (2)

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

Ques. 2JEE Main 2024, 30 January (Morning Shift)

Structure of 4-Methylpent-2-enal is :

  1. H2C= H |C- CH3 | H |C-CH2- O \|C-H
  2. CH3-CH2- CH3 |C=CH- O \|C-H
  3. CH3- CH3 |CH-CH=CH- O \|C-H
  4. CH3-CH2-CH= CH3 |C- O \|C-H
Ques. 3JEE Main 2024, 30 January (Evening Shift)

The correct stability order of carbocations is

  1. (CH3)3C > CH3- CH2 > (CH3)2 CH > CH3
  2. (CH3)3 C > (CH3)2 CH > CH3- CH2 > CH3
  3. CH3 > CH3- CH2 > CH3- CH3 | CH > (CH3)3C
  4. CH3 > (CH3)2 CH > CH3- CH2 > (CH3)3 C
Ques. 4JEE Main 2024, 30 January (Evening Shift)

IUPAC name of following compound is : CH3- NH2 |CH-CH2-CN

  1. 2-Aminobutanenitrile
  2. 3-Aminopropanenitrile
  3. 2-Aminopentanenitrile
  4. 3-Aminobutanenitrile
Ques. 5JEE Main 2024, 29 January (Morning Shift)

The difference in energy between the actual structure and the lowest energy resonance structure for a given compound is

  1. electromeric energy
  2. resonance energy
  3. ionization energy
  4. hyperconjugation energy
Ques. 6JEE 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
Ques. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE Main 2024, 29 January (Evening Shift)

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

Ques. 11JEE Main 2024, 27 January (Morning Shift)

Which of the following is strongest Bronsted base?

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

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