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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 4th April Evening ShiftMCQMedium📈 Topic in 14% papers+4−1
Ques. 1JEE 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

Answer

(1) d > c > b > a

Solution

d: cyclic, planar, 6 electrons (4n + 2, n = 1) ⇒ aromatic ⇒ most stable

a: cyclic, planar, 4 electrons (4n, n = 1) ⇒ anti-aromatic ⇒ least stable

c and b: sp3 carbanions, non-aromatic; four-membered ring b has more angle strain than five-membered ring c ⇒ c > b

∴ d > c > b > a

Answer: (1)

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

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

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

Ques. 3JEE Main 2024, 4 April (Evening Shift)

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

Ques. 4JEE 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. 5JEE Main 2024, 1 February (Evening Shift)

The functional group that shows negative resonance effect is :

  1. -OH
  2. -OR
  3. -COOH
  4. -NH2
Ques. 6JEE 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. 7JEE 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. 8JEE Main 2024, 30 January (Morning Shift)

Which of the following molecule/species is most stable?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE 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. 10JEE 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. 11JEE 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

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