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Organic Chemistry – Some Basic Principles and Techniques

JEE Main 2025 (Online) 24th January Evening ShiftMCQEasy📈 Topic in 8% papers+4−1
Ques. 1JEE 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

Answer

(1) 3 and 5

Solution

Triple-bond and C N carbons are sp; double-bond carbons are sp2.

[figure]

sp = 3, sp2 = 5

Answer: (1)

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Ques. 2JEE Main 2025, 24 January (Evening Shift)

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

Ques. 3JEE 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. 4JEE 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. 5JEE Main 2025, 22 January (Evening Shift)

The most stable carbocation from the following is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE 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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