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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 8th April Evening ShiftNumericalMedium📈 Topic in 14% papers+4
Ques. 1JEE Main 2024, 8 April (Evening Shift)

Total number of aromatic compounds among the following compounds is . [figure]

Answer

1

Solution

[figure]

A compound is aromatic if it is cyclic, planar, fully conjugated and has (4n + 2) π electrons (Hückel rule).

(i), (ii), (vi): each has an sp3 (CH2) ring carbon, so there is no cyclic conjugation; non-aromatic.

(iii): 4π electrons (4n) in a planar ring, so antiaromatic.

(iv): 8π electrons in a tub-shaped (non-planar) ring, so non-aromatic.

(v): pyridine has 6π electrons (the N lone pair lies in the ring plane and is not counted), so aromatic.

Hence only 1 compound is aromatic.

Answer: 1

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Ques. 2JEE Main 2024, 6 April (Morning Shift)

Functional group present in sulphonic acids is :

  1. -SO2
  2. [figure]
  3. -SO3H
  4. -SO4H
Ques. 3JEE Main 2024, 6 April (Evening Shift)

[figure] The correct arrangement for decreasing order of electrophilic substitution for above compounds is :

  1. (III) > (IV) > (II) > (I)
  2. (III) > (I) > (II) > (IV)
  3. (II) > (IV) > (III) > (I)
  4. (IV) > (I) > (II) > (III)
Ques. 4JEE Main 2024, 6 April (Evening Shift)

Number of carbocations from the following that are not stabilized by hyperconjugation is . [figure]

Ques. 5JEE Main 2024, 5 April (Morning Shift)

Number of and bonds present in ethylene molecule is respectively :

  1. 3 and 1
  2. 5 and 1
  3. 4 and 1
  4. 5 and 2
Ques. 6JEE Main 2024, 5 April (Evening Shift)

The correct nomenclature for the following compound is : [figure]

  1. 2-carboxy-4-hydroxyhept-7-enal
  2. 2-formyl-4-hydroxyhept-7-enoic acid
  3. 2-carboxy-4-hydroxyhept-6-enal
  4. 2-formyl-4-hydroxyhept-6-enoic acid
Ques. 7JEE Main 2024, 4 April (Morning Shift)

What will be the decreasing order of basic strength of the following conjugate bases? -OH, R O, CH3CO O, C l

  1. C l > R O > -OH > CH3CO O
  2. -OH > R O > CH3CO O > C l
  3. C l > -OH > R O > CH3CO O
  4. R O > -OH > CH3CO O > C l
Ques. 8JEE 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)
Ques. 9JEE 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. 10JEE 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. 11JEE Main 2024, 4 April (Evening Shift)

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

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