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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2024 (Online) 8th April Morning ShiftMCQEasy📈 Topic in 3% papers+4−1
Ques. 1JEE Main 2024, 8 April (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. Both Statement I and Statement II are incorrect.
  2. Both Statement I and Statement II are correct.
  3. Statement I is correct but Statement II is incorrect.
  4. Statement I is incorrect but Statement II is correct.

Answer

(4) Statement I is incorrect but Statement II is correct.

Solution

Rule: lowest locant set first; if still tied, the group cited first in alphabetical order gets the lower number.

[figure]

Statement I: locants (1, 2, 4) with Cl = 1 are lower than (1, 3, 4), and chloro also comes first alphabetically, so the name is 1-chloro-2,4-dinitrobenzene. Statement I is incorrect.

[figure]

Statement II: the parent is aniline (C bearing -NH2 = C-1), so CH3 is at C-2 and C2H5 at C-4; ethyl is cited before methyl, giving 4-ethyl-2-methylaniline. Statement II is correct.

Answer: (4)

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Ques. 2JEE Main 2024, 8 April (Evening Shift)

The shape of carbocation is :

  1. tetrahedral
  2. diagonal pyramidal
  3. diagonal
  4. trigonal planar
Ques. 3JEE Main 2024, 8 April (Evening Shift)

IUPAC name of following hydrocarbon(X) is : CH3- CH3 |CH-CH2- (X)CH2- CH3 |CH- CH3 |CH-CH2-CH3

  1. 2,5,6-Trimethyloctane
  2. 2-Ethyl-2,6-diethylheptane
  3. 3,4,7-Trimethyloctane
  4. 2-Ethyl-3,6-dimethylheptane
Ques. 4JEE Main 2024, 8 April (Evening Shift)

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

Ques. 5JEE Main 2024, 6 April (Morning Shift)

Functional group present in sulphonic acids is :

  1. -SO2
  2. [figure]
  3. -SO3H
  4. -SO4H
Ques. 6JEE 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. 7JEE Main 2024, 6 April (Evening Shift)

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

Ques. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE 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)

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