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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2025 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 8% papers+4−1
Ques. 1JEE Main 2025, 29 January (Evening Shift)

Total number of sigma ( ) and pi( ) bonds respectively present in hex-1-en-4-yne are:

  1. 14 and 3
  2. 11 and 3
  3. 13 and 3
  4. 3 and 13

Answer

(3) 13 and 3

Solution

CH2=CH-CH2-C C-CH3 (C6H8)

σ: 5 C–C + 8 C–H = 13; π: 1 + 2 = 3.

Answer: (3)

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Ques. 2JEE Main 2025, 28 January (Morning Shift)

The correct order of stability of following carbocations is : [figure]

  1. A > B > C > D
  2. C > B > A > D
  3. B > C > A > D
  4. C > A > B > D
Ques. 3JEE Main 2025, 24 January (Morning Shift)

Which one of the carbocations from the following is most stable?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4JEE Main 2025, 24 January (Evening Shift)

In the given structure, number of sp and sp2 hybridized carbon atoms present respectively are : [figure]

  1. 3 and 5
  2. 3 and 6
  3. 4 and 5
  4. 4 and 6
Ques. 5JEE Main 2025, 24 January (Evening Shift)

The hydrocarbon (X) with molar mass 80 g mol-1 and 90\% carbon has degree of unsaturation.

Ques. 6JEE Main 2025, 23 January (Morning Shift)

The correct stability order of the following species/molecules is : [figure]

  1. q > r > p
  2. q > p > r
  3. p > q > r
  4. r > q > p
Ques. 7JEE Main 2025, 22 January (Morning Shift)

The IUPAC name of the following compound is : [figure]

  1. 5-Methoxycarbonyl-2-methylhexanoic acid
  2. Methyl-5-carboxy-2-methylhexanoate.
  3. 2-Carboxy-5-methoxycarbonylhexane.
  4. Methyl-6-carboxy-2,5-dimethylhexanoate.
Ques. 8JEE Main 2025, 22 January (Evening Shift)

The most stable carbocation from the following is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE Main 2025, 22 January (Evening Shift)

The alkane from below having two secondary hydrogens is :

  1. 2,2,4,5-Tetramethylheptane
  2. 2,2,4,4-Tetramethylhexane
  3. 4-Ethyl-3,4-dimethyloctane
  4. 2,2,3,3-Tetramethylpentane

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