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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 4th April Morning ShiftMatchingMedium📈 Topic in 3% papers+4−1
Ques. 1JEE Main 2024, 4 April (Morning Shift)

Match List I with List II : Choose the correct answer from the options given below :

  1. (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
  2. (A) - (II), (B) - (IV), (C) - (III), (D) - (I)
  3. (A) - (III), (B) - (I), (C) - (II), (D) - (IV)
  4. (A) - (IV), (B) - (III), (C) - (I), (D) - (II)

Answer

(4) (A) - (IV), (B) - (III), (C) - (I), (D) - (II)

Solution

R effect: permanent π-electron shift in a conjugated system; E effect: temporary π shift only when a reagent attacks.

(A): lone pair of –NH2 is pushed into the ring ⇒ (A) is +R (IV)

(B): π electrons move to the C that bonds with the electrophile H+ ⇒ (B) is +E (III)

(C): π electrons move away from the C attacked by the nucleophile CN- ⇒ (C) is −E (I)

(D): ring π electrons are pulled towards –NO2 ⇒ (D) is −R (II)

Answer: (4)

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

Ques. 2JEE Main 2024, 4 April (Morning Shift)

Which among the following is incorrect statement?

  1. The electromeric effect is a temporary effect
  2. Hydrogen ion (H+) shows negative electromeric effect
  3. The organic compound shows electromeric effect in the presence of the reagent only.
  4. Electromeric effect dominates over inductive effect
Ques. 3JEE Main 2024, 4 April (Evening Shift)

Correct order of stability of carbanions is : [figure]

  1. d > c > b > a
  2. c > b > d > a
  3. d > a > c > b
  4. a > b > c > d
Ques. 4JEE Main 2024, 4 April (Evening Shift)

The total number of 'sigma' and 'pi' bonds in 2-oxohex-4-ynoic acid is .

Ques. 5JEE Main 2024, 4 April (Evening Shift)

Vanillin compound obtained from vanilla beans, has total sum of oxygen atoms and electrons is .

Ques. 6JEE Main 2024, 1 February (Morning Shift)

Ionic reactions with organic compounds proceed through : Choose the correct answer from the options given below :

  1. (A) only
  2. (B) only
  3. (C) only
  4. (D) and (E) only
Ques. 7JEE Main 2024, 1 February (Evening Shift)

The functional group that shows negative resonance effect is :

  1. -OH
  2. -OR
  3. -COOH
  4. -NH2
Ques. 8JEE Main 2024, 31 January (Morning Shift)

A species having carbon with sextet of electrons and can act as electrophile is called

  1. pentavalent carbon
  2. carbon free radical
  3. carbanion
  4. carbocation
Ques. 9JEE Main 2024, 31 January (Morning Shift)

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

  1. Statement I is incorrect but Statement II is correct.
  2. Statement I is correct but Statement II is incorrect.
  3. Both Statement I and Statement II are correct.
  4. Both Statement I and Statement II are incorrect.
Ques. 10JEE Main 2024, 30 January (Morning Shift)

Which of the following molecule/species is most stable?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11JEE 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

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